Location: Winslow, Rice, Jafri, Marban, Ororke, 1999 @ 0e3b69fc1adb / winslow_rice_jafri_marban_ororke_1999.cellml

Author:
rcai987 <devnull@localhost>
Date:
2014-12-19 12:38:23+13:00
Desc:
Added annotations to winslow_rice_jafri_marban_ororke_1999 model
Permanent Source URI:
https://staging.physiomeproject.org/workspace/winslow_rice_jafri_marban_ororke_1999/rawfile/0e3b69fc1adb32cf77cf96c4882a3ecdeb56c194/winslow_rice_jafri_marban_ororke_1999.cellml

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COR (0.9.31.857)
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http://COR.physiol.ox.ac.uk/ - COR@physiol.ox.ac.uk

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http://www.CellML.org/
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<article>
  <articleinfo>
  <title>Canine Ventricular Cell Model, 1999</title>
  <author>
    <firstname>Catherine</firstname>
          <surname>Lloyd</surname>
    <affiliation>
      <shortaffil>Auckland Bioengineering Institute, The University of Auckland</shortaffil>
    </affiliation>
  </author>
</articleinfo>
  <section id="sec_status">
    <title>Model Status</title>
    <para>
            This model has been curated and unit-checked by Penny Noble and is known to run in PCEnv and COR to replicate the published results.
          </para>
  </section>
  <sect1 id="sec_structure">
<title>Model Structure</title>

<para>
In 1999 Raimond Winslow, Jeremy Rice, Saleet Jafri, Eduardo Marban and Brian O'Rourke published a computational model of the action potential and of intracellular Ca<superscript>2+</superscript> handling in normal and failing canine ventricular myocytes.  Using the experimental data of O'Rourke <emphasis>et al</emphasis> (1999) they modified Jafri <emphasis>et al's</emphasis> guinea pig ventricular cell model (1999) to make it appropriate for canine midmyocardial cells (see the figure below).  The CellML description here is of the normal canine ventricular myocyte model.  In failing myocytes i_to1 and i_K1 are down regulated on average by 66 percent and 32 percent respectively.  The kinetic properties of i_to1 and the gating behaviour if i_K1 remain unaltered.  Only the number of expressed channels is reduced (the control may be pre- or post-transcriptional but it is not post-translational).  On the basis of these data, the effects of terminal heart failure are modelled by reducing the peak conductance of i_to1 and i_K1.  Downregulation of the sarcoplasmic reticulum Ca<superscript>2+</superscript> pump is modelled by simultaneous scaling of both the forward and reverse maximum pump rates V<subscript>maxf</subscript> and V<subscript>maxr</subscript> by a scale factor K<subscript>SR</subscript>.  Upregulation of the Na-Ca exchanger is modelled by increasing a scale factor K<subscript>NaCa</subscript>. 
</para>

<para>
The complete original paper reference is cited below:
</para>

<para>
Mechanisms of Altered Excitation-Contraction Coupling in Canine Tachycardia-Induced Heart Failure, II Model Studies, Raimond L. Winslow, Jeremy Rice, Saleet Jafri, Eduardo Marban and Brian O'Rourke, 1999, <emphasis>Circulation Research</emphasis>, 84, 571-586.  <ulink url="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&amp;db=PubMed&amp;list_uids=10082479&amp;dopt=Abstract">PubMed ID: 10082479</ulink>
</para>

<informalfigure float="0" id="fig_cell_diagram">
<mediaobject>
  <imageobject>
    <objectinfo>
      <title>cell diagram of the Winslow et al ventricular cell model showing ionic currents, pumps and exchangers within the sarcolemma and the sarcoplasmic reticulum</title>
    </objectinfo>
    <imagedata fileref="winslow_1999.png"/>
  </imageobject>
</mediaobject>
<caption>A schematic diagram describing the current flows across the cell membrane that are captured in the Winslow <emphasis>et al</emphasis> canine ventricular cell model.</caption>
</informalfigure>

</sect1>
</article>
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         <apply>
            <eq/>
            <ci>alpha_j</ci>
            <piecewise>
               <piece>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1000</cn>
                        <apply>
                           <minus/>
                           <apply>
                              <plus/>
                              <apply>
                                 <times/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt_second">127140</cn>
                                 <apply>
                                    <exp/>
                                    <apply>
                                       <times/>
                                       <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.2444</cn>
                                       <ci>V</ci>
                                    </apply>
                                 </apply>
                              </apply>
                              <apply>
                                 <times/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt_second">0.00003474</cn>
                                 <apply>
                                    <exp/>
                                    <apply>
                                       <times/>
                                       <apply>
                                          <minus/>
                                          <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.04391</cn>
                                       </apply>
                                       <ci>V</ci>
                                    </apply>
                                 </apply>
                              </apply>
                           </apply>
                        </apply>
                        <apply>
                           <plus/>
                           <ci>V</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">37.78</cn>
                        </apply>
                     </apply>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.311</cn>
                              <apply>
                                 <plus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">79.23</cn>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
                  <apply>
                     <lt/>
                     <ci>V</ci>
                     <apply>
                        <minus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">40</cn>
                     </apply>
                  </apply>
               </piece>
               <otherwise>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">0</cn>
               </otherwise>
            </piecewise>
         </apply>
         <apply>
            <eq/>
            <ci>beta_j</ci>
            <piecewise>
               <piece>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">121.2</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.01052</cn>
                              </apply>
                              <ci>V</ci>
                           </apply>
                        </apply>
                     </apply>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.1378</cn>
                              </apply>
                              <apply>
                                 <plus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">40.14</cn>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
                  <apply>
                     <lt/>
                     <ci>V</ci>
                     <apply>
                        <minus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">40</cn>
                     </apply>
                  </apply>
               </piece>
               <otherwise>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">300</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.0000002535</cn>
                              </apply>
                              <ci>V</ci>
                           </apply>
                        </apply>
                     </apply>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.1</cn>
                              </apply>
                              <apply>
                                 <plus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">32</cn>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
               </otherwise>
            </piecewise>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>j</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>alpha_j</ci>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                     <ci>j</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>beta_j</ci>
                  <ci>j</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00008" name="rapid_activating_delayed_rectifiyer_K_current">
      <variable cmeta:id="rapid_activating_delayed_rectifiyer_K_current_i_Kr" name="i_Kr" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00009" name="E_K" public_interface="out" units="millivolt"/>
      <variable cmeta:id="id_00010" initial_value="0.0034" name="g_Kr" units="milliS_per_microF"/>
      <variable name="f_Ko" units="dimensionless"/>
      <variable name="R_V" units="dimensionless"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="Ko" public_interface="in" units="millimolar"/>
      <variable name="Ki" public_interface="in" units="millimolar"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="X_kr" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>E_K</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>R</ci>
                     <ci>T</ci>
                  </apply>
                  <ci>F</ci>
               </apply>
               <apply>
                  <ln/>
                  <apply>
                     <divide/>
                     <ci>Ko</ci>
                     <ci>Ki</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>f_Ko</ci>
            <apply>
               <root/>
               <apply>
                  <divide/>
                  <ci>Ko</ci>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">4</cn>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>R_V</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1.4945</cn>
                     <apply>
                        <exp/>
                        <apply>
                           <times/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.0446</cn>
                           <ci>V</ci>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_Kr</ci>
            <apply>
               <times/>
               <ci>g_Kr</ci>
               <ci>f_Ko</ci>
               <ci>R_V</ci>
               <ci>X_kr</ci>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_K</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00011" name="rapid_activating_delayed_rectifiyer_K_current_X_kr_gate">
      <variable initial_value="0.51" name="X_kr" public_interface="out" units="dimensionless"/>
      <variable name="K12" units="dimensionless"/>
      <variable name="K21" units="dimensionless"/>
      <variable name="X_kr_inf" units="dimensionless"/>
      <variable name="tau_X_kr" units="second"/>
      <variable initial_value="1" name="tau_factor" units="dimensionless"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>K12</ci>
            <apply>
               <exp/>
               <apply>
                  <plus/>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">5.495</cn>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.1691</cn>
                     <ci>V</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>K21</ci>
            <apply>
               <exp/>
               <apply>
                  <minus/>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">7.677</cn>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.0128</cn>
                     <ci>V</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>X_kr_inf</ci>
            <apply>
               <divide/>
               <ci>K12</ci>
               <apply>
                  <plus/>
                  <ci>K12</ci>
                  <ci>K21</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>tau_X_kr</ci>
            <apply>
               <plus/>
               <apply>
                  <divide/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="second">0.001</cn>
                  <apply>
                     <plus/>
                     <ci>K12</ci>
                     <ci>K21</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>tau_factor</ci>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="second">0.027</cn>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>X_kr</ci>
            </apply>
            <apply>
               <divide/>
               <apply>
                  <minus/>
                  <ci>X_kr_inf</ci>
                  <ci>X_kr</ci>
               </apply>
               <ci>tau_X_kr</ci>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00012" name="slow_activating_delayed_rectifiyer_K_current">
      <variable cmeta:id="slow_activating_delayed_rectifiyer_K_current_i_Ks" name="i_Ks" public_interface="out" units="microA_per_microF"/>
      <variable initial_value="0.0027134" name="g_Ks" units="milliS_per_microF"/>
      <variable name="E_Ks" units="millivolt"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="Ko" public_interface="in" units="millimolar"/>
      <variable name="Ki" public_interface="in" units="millimolar"/>
      <variable name="Nao" public_interface="in" units="millimolar"/>
      <variable name="Nai" public_interface="in" units="millimolar"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="X_ks" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>E_Ks</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>R</ci>
                     <ci>T</ci>
                  </apply>
                  <ci>F</ci>
               </apply>
               <apply>
                  <ln/>
                  <apply>
                     <divide/>
                     <apply>
                        <plus/>
                        <ci>Ko</ci>
                        <apply>
                           <times/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.01833</cn>
                           <ci>Nao</ci>
                        </apply>
                     </apply>
                     <apply>
                        <plus/>
                        <ci>Ki</ci>
                        <apply>
                           <times/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.01833</cn>
                           <ci>Nai</ci>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_Ks</ci>
            <apply>
               <times/>
               <ci>g_Ks</ci>
               <apply>
                  <power/>
                  <ci>X_ks</ci>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
               </apply>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_Ks</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00013" name="slow_activating_delayed_rectifiyer_K_current_X_ks_gate">
      <variable initial_value="0.264" name="X_ks" public_interface="out" units="dimensionless"/>
      <variable name="tau_X_ks" units="second"/>
      <variable name="X_ks_infinity" units="dimensionless"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>X_ks_infinity</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <minus/>
                           <apply>
                              <minus/>
                              <ci>V</ci>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">24.7</cn>
                           </apply>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">13.6</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>tau_X_ks</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="second">0.001</cn>
               <apply>
                  <plus/>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.0000719</cn>
                        <apply>
                           <minus/>
                           <ci>V</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">10</cn>
                        </apply>
                     </apply>
                     <apply>
                        <minus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.148</cn>
                              </apply>
                              <apply>
                                 <minus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">10</cn>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.000131</cn>
                        <apply>
                           <minus/>
                           <ci>V</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">10</cn>
                        </apply>
                     </apply>
                     <apply>
                        <minus/>
                        <apply>
                           <exp/>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.0687</cn>
                              <apply>
                                 <minus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">10</cn>
                              </apply>
                           </apply>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>X_ks</ci>
            </apply>
            <apply>
               <divide/>
               <apply>
                  <minus/>
                  <ci>X_ks_infinity</ci>
                  <ci>X_ks</ci>
               </apply>
               <ci>tau_X_ks</ci>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00014" name="transient_outward_potassium_current">
      <variable cmeta:id="transient_outward_potassium_current_i_to1" name="i_to1" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00017" initial_value="0.23815" name="g_to1" units="milliS_per_microF"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="E_K" public_interface="in" units="millivolt"/>
      <variable cmeta:id="id_00066" name="X_to1" private_interface="in" units="dimensionless"/>
      <variable cmeta:id="id_00065" name="Y_to1" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_to1</ci>
            <apply>
               <times/>
               <ci>g_to1</ci>
               <ci>X_to1</ci>
               <ci>Y_to1</ci>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_K</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00015" name="transient_outward_potassium_current_X_to1_gate">
      <variable initial_value="2.63" name="X_to1" public_interface="out" units="dimensionless"/>
      <variable name="alpha_X_to1" units="per_second"/>
      <variable name="beta_X_to1" units="per_second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>alpha_X_to1</ci>
            <apply>
               <times/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">45.16</cn>
               <apply>
                  <exp/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.03577</cn>
                     <ci>V</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_X_to1</ci>
            <apply>
               <times/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">98.9</cn>
               <apply>
                  <exp/>
                  <apply>
                     <times/>
                     <apply>
                        <minus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_millivolt">0.06237</cn>
                     </apply>
                     <ci>V</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>X_to1</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>alpha_X_to1</ci>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                     <ci>X_to1</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>beta_X_to1</ci>
                  <ci>X_to1</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00016" name="transient_outward_potassium_current_Y_to1_gate">
      <variable initial_value="0.99" name="Y_to1" public_interface="out" units="dimensionless"/>
      <variable name="alpha_Y_to1" units="per_second"/>
      <variable name="beta_Y_to1" units="per_second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>alpha_Y_to1</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">5.415</cn>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <minus/>
                           <apply>
                              <plus/>
                              <ci>V</ci>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">33.5</cn>
                           </apply>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5</cn>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.051335</cn>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <minus/>
                              <apply>
                                 <plus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">33.5</cn>
                              </apply>
                           </apply>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5</cn>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_Y_to1</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">5.415</cn>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <plus/>
                           <ci>V</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">33.5</cn>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5</cn>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.051335</cn>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <plus/>
                              <ci>V</ci>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">33.5</cn>
                           </apply>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5</cn>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Y_to1</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>alpha_Y_to1</ci>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                     <ci>Y_to1</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>beta_Y_to1</ci>
                  <ci>Y_to1</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00018" name="time_independent_potassium_current">
      <variable cmeta:id="time_independent_potassium_current_i_K1" name="i_K1" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00019" initial_value="2.8" name="g_K1" units="milliS_per_microF"/>
      <variable cmeta:id="id_00067" initial_value="13" name="K_mK1" units="millimolar"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="R" private_interface="out" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" private_interface="out" public_interface="in" units="kelvin"/>
      <variable name="F" private_interface="out" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="E_K" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="Ko" public_interface="in" units="millimolar"/>
      <variable name="K1_infinity_V" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_K1</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>g_K1</ci>
                     <ci>K1_infinity_V</ci>
                     <ci>Ko</ci>
                  </apply>
                  <apply>
                     <plus/>
                     <ci>Ko</ci>
                     <ci>K_mK1</ci>
                  </apply>
               </apply>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_K</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00020" name="time_independent_potassium_current_K1_gate">
      <variable name="K1_infinity_V" public_interface="out" units="dimensionless"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="E_K" public_interface="in" units="millivolt"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>K1_infinity_V</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                  <apply>
                     <exp/>
                     <apply>
                        <times/>
                        <apply>
                           <divide/>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1.5</cn>
                              <ci>F</ci>
                           </apply>
                           <apply>
                              <times/>
                              <ci>R</ci>
                              <ci>T</ci>
                           </apply>
                        </apply>
                        <apply>
                           <minus/>
                           <ci>V</ci>
                           <ci>E_K</ci>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00021" name="plateau_potassium_current">
      <variable cmeta:id="plateau_potassium_current_i_Kp" name="i_Kp" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00022" initial_value="0.002216" name="g_Kp" units="milliS_per_microF"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable cmeta:id="id_00023" name="E_K" public_interface="in" units="millivolt"/>
      <variable cmeta:id="id_00024" name="Kp_V" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_Kp</ci>
            <apply>
               <times/>
               <ci>g_Kp</ci>
               <ci>Kp_V</ci>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_K</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00025" name="plateau_potassium_current_Kp_gate">
      <variable name="Kp_V" public_interface="out" units="dimensionless"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>Kp_V</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <minus/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">7.488</cn>
                           <ci>V</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5.98</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00028" name="Na_Ca_exchanger">
      <variable cmeta:id="Na_Ca_exchanger_i_NaCa" name="i_NaCa" public_interface="out" units="microA_per_microF"/>
      <variable initial_value="1.38" name="K_mCa" units="millimolar"/>
      <variable initial_value="87.5" name="K_mNa" units="millimolar"/>
      <variable cmeta:id="id_00029" initial_value="0.3" name="K_NaCa" units="microA_per_microF"/>
      <variable initial_value="0.2" name="K_sat" units="dimensionless"/>
      <variable initial_value="0.35" name="eta" units="dimensionless"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="Nai" public_interface="in" units="millimolar"/>
      <variable name="Nao" public_interface="in" units="millimolar"/>
      <variable name="Cai" public_interface="in" units="millimolar"/>
      <variable name="Cao" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_NaCa</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>K_NaCa</ci>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">5000</cn>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <plus/>
                        <apply>
                           <power/>
                           <ci>K_mNa</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        </apply>
                        <apply>
                           <power/>
                           <ci>Nao</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        </apply>
                     </apply>
                     <apply>
                        <plus/>
                        <ci>K_mCa</ci>
                        <ci>Cao</ci>
                     </apply>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <times/>
                           <ci>K_sat</ci>
                           <apply>
                              <exp/>
                              <apply>
                                 <divide/>
                                 <apply>
                                    <times/>
                                    <apply>
                                       <minus/>
                                       <ci>eta</ci>
                                       <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                                    </apply>
                                    <ci>V</ci>
                                    <ci>F</ci>
                                 </apply>
                                 <apply>
                                    <times/>
                                    <ci>R</ci>
                                    <ci>T</ci>
                                 </apply>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <minus/>
                  <apply>
                     <times/>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <times/>
                              <ci>eta</ci>
                              <ci>V</ci>
                              <ci>F</ci>
                           </apply>
                           <apply>
                              <times/>
                              <ci>R</ci>
                              <ci>T</ci>
                           </apply>
                        </apply>
                     </apply>
                     <apply>
                        <power/>
                        <ci>Nai</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <ci>Cao</ci>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <ci>eta</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                              </apply>
                              <ci>V</ci>
                              <ci>F</ci>
                           </apply>
                           <apply>
                              <times/>
                              <ci>R</ci>
                              <ci>T</ci>
                           </apply>
                        </apply>
                     </apply>
                     <apply>
                        <power/>
                        <ci>Nao</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <ci>Cai</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00030" name="sodium_potassium_pump">
      <variable cmeta:id="sodium_potassium_pump_i_NaK" name="i_NaK" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00031" initial_value="0.693" name="I_NaK" units="microA_per_microF"/>
      <variable cmeta:id="id_00032" name="f_NaK" units="dimensionless"/>
      <variable initial_value="10" name="K_mNai" units="millimolar"/>
      <variable initial_value="1.5" name="K_mKo" units="millimolar"/>
      <variable name="sigma" units="dimensionless"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="Nai" public_interface="in" units="millimolar"/>
      <variable name="Nao" public_interface="in" units="millimolar"/>
      <variable name="Ko" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>f_NaK</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.1245</cn>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.1</cn>
                              </apply>
                              <ci>V</ci>
                              <ci>F</ci>
                           </apply>
                           <apply>
                              <times/>
                              <ci>R</ci>
                              <ci>T</ci>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.0365</cn>
                     <ci>sigma</ci>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <times/>
                              <apply>
                                 <minus/>
                                 <ci>V</ci>
                              </apply>
                              <ci>F</ci>
                           </apply>
                           <apply>
                              <times/>
                              <ci>R</ci>
                              <ci>T</ci>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>sigma</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">7</cn>
               </apply>
               <apply>
                  <minus/>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <ci>Nao</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">67.3</cn>
                     </apply>
                  </apply>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_NaK</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>I_NaK</ci>
                        <ci>f_NaK</ci>
                     </apply>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <power/>
                           <apply>
                              <divide/>
                              <ci>K_mNai</ci>
                              <ci>Nai</ci>
                           </apply>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1.5</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>Ko</ci>
               </apply>
               <apply>
                  <plus/>
                  <ci>Ko</ci>
                  <ci>K_mKo</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00036" name="sarcolemmal_calcium_pump">
      <variable cmeta:id="sarcolemmal_calcium_pump_i_p_Ca" name="i_p_Ca" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00037" initial_value="0.00005" name="K_mpCa" units="millimolar"/>
      <variable cmeta:id="id_00038" initial_value="0.05" name="I_pCa" units="microA_per_microF"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="Cai" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_p_Ca</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <ci>I_pCa</ci>
                  <ci>Cai</ci>
               </apply>
               <apply>
                  <plus/>
                  <ci>K_mpCa</ci>
                  <ci>Cai</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00039" name="calcium_background_current">
      <variable cmeta:id="calcium_background_current_i_Ca_b" name="i_Ca_b" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00040" initial_value="0.0003842" name="g_Cab" units="milliS_per_microF"/>
      <variable cmeta:id="id_00041" name="E_Ca" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="Cai" public_interface="in" units="millimolar"/>
      <variable name="Cao" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>E_Ca</ci>
            <apply>
               <times/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>R</ci>
                     <ci>T</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     <ci>F</ci>
                  </apply>
               </apply>
               <apply>
                  <ln/>
                  <apply>
                     <divide/>
                     <ci>Cao</ci>
                     <ci>Cai</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_Ca_b</ci>
            <apply>
               <times/>
               <ci>g_Cab</ci>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_Ca</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00057" name="sodium_background_current">
      <variable cmeta:id="sodium_background_current_i_Na_b" name="i_Na_b" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00058" initial_value="0.0031" name="g_Nab" units="milliS_per_microF"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable cmeta:id="id_00059" name="E_Na" public_interface="in" units="millivolt"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_Na_b</ci>
            <apply>
               <times/>
               <ci>g_Nab</ci>
               <apply>
                  <minus/>
                  <ci>V</ci>
                  <ci>E_Na</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00042" name="L_type_Ca_current">
      <variable cmeta:id="id_00043" name="i_Ca" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="L_type_Ca_current_i_Ca_K" name="i_Ca_K" public_interface="out" units="microA_per_microF"/>
      <variable cmeta:id="id_00044" initial_value="3.125e-4" name="P_Ca" units="cm_per_second"/>
      <variable initial_value="5.79e-7" name="P_K" units="cm_per_second"/>
      <variable name="p_prime_k" units="cm_per_second"/>
      <variable initial_value="-0.265" name="i_Ca_half" units="microA_per_microF"/>
      <variable name="i_Ca_max" units="microA_per_microF"/>
      <variable initial_value="9.84546e-21" name="O" units="dimensionless"/>
      <variable initial_value="0" name="O_Ca" units="dimensionless"/>
      <variable name="alpha" units="per_second"/>
      <variable name="beta" units="per_second"/>
      <variable name="gamma" units="per_second"/>
      <variable name="alpha_a" units="per_second"/>
      <variable name="beta_b" units="per_second"/>
      <variable initial_value="2" name="a" units="dimensionless"/>
      <variable initial_value="2" name="b" units="dimensionless"/>
      <variable initial_value="2000" name="g" units="per_second"/>
      <variable initial_value="300" name="f" units="per_second"/>
      <variable initial_value="7000" name="gprime" units="per_second"/>
      <variable initial_value="7" name="fprime" units="per_second"/>
      <variable initial_value="10" name="omega" units="per_second"/>
      <variable initial_value="0.997208" name="C0" units="dimensionless"/>
      <variable initial_value="6.38897e-5" name="C1" units="dimensionless"/>
      <variable initial_value="1.535e-9" name="C2" units="dimensionless"/>
      <variable initial_value="1.63909e-14" name="C3" units="dimensionless"/>
      <variable initial_value="6.56337e-20" name="C4" units="dimensionless"/>
      <variable initial_value="0.00272826" name="C_Ca0" units="dimensionless"/>
      <variable initial_value="6.99215e-7" name="C_Ca1" units="dimensionless"/>
      <variable initial_value="6.71989e-11" name="C_Ca2" units="dimensionless"/>
      <variable initial_value="2.87031e-15" name="C_Ca3" units="dimensionless"/>
      <variable initial_value="4.59752e-20" name="C_Ca4" units="dimensionless"/>
      <variable name="time" private_interface="out" public_interface="in" units="second"/>
      <variable name="V" private_interface="out" public_interface="in" units="millivolt"/>
      <variable name="C_sc" public_interface="in" units="microF_per_cm2"/>
      <variable name="Ca_ss" public_interface="in" units="millimolar"/>
      <variable name="Cao" public_interface="in" units="millimolar"/>
      <variable name="Ko" public_interface="in" units="millimolar"/>
      <variable name="Ki" public_interface="in" units="millimolar"/>
      <variable name="R" public_interface="in" units="joule_per_mole_kelvin"/>
      <variable name="T" public_interface="in" units="kelvin"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="y" private_interface="in" units="dimensionless"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>i_Ca</ci>
            <apply>
               <times/>
               <ci>i_Ca_max</ci>
               <ci>y</ci>
               <apply>
                  <plus/>
                  <ci>O</ci>
                  <ci>O_Ca</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_Ca_K</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <apply>
                           <divide/>
                           <ci>p_prime_k</ci>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="s_ms">1</cn>
                           </apply>
                        </apply>
                        <ci>y</ci>
                        <apply>
                           <plus/>
                           <ci>O</ci>
                           <ci>O_Ca</ci>
                        </apply>
                        <ci>V</ci>
                        <apply>
                           <power/>
                           <ci>F</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                     </apply>
                     <apply>
                        <times/>
                        <ci>R</ci>
                        <ci>T</ci>
                     </apply>
                  </apply>
                  <apply>
                     <minus/>
                     <apply>
                        <times/>
                        <ci>Ki</ci>
                        <apply>
                           <exp/>
                           <apply>
                              <divide/>
                              <apply>
                                 <times/>
                                 <ci>V</ci>
                                 <ci>F</ci>
                              </apply>
                              <apply>
                                 <times/>
                                 <ci>R</ci>
                                 <ci>T</ci>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                     <ci>Ko</ci>
                  </apply>
               </apply>
               <apply>
                  <minus/>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <times/>
                           <ci>V</ci>
                           <ci>F</ci>
                        </apply>
                        <apply>
                           <times/>
                           <ci>R</ci>
                           <ci>T</ci>
                        </apply>
                     </apply>
                  </apply>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>p_prime_k</ci>
            <apply>
               <divide/>
               <ci>P_K</ci>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <divide/>
                     <ci>i_Ca_max</ci>
                     <ci>i_Ca_half</ci>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>i_Ca_max</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <apply>
                           <divide/>
                           <ci>P_Ca</ci>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="s_ms">1</cn>
                           </apply>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        <ci>V</ci>
                        <apply>
                           <power/>
                           <ci>F</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1000</cn>
                     </apply>
                     <apply>
                        <times/>
                        <ci>R</ci>
                        <ci>T</ci>
                     </apply>
                  </apply>
                  <apply>
                     <minus/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">0.001</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <divide/>
                              <apply>
                                 <times/>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                                 <ci>V</ci>
                                 <ci>F</ci>
                              </apply>
                              <apply>
                                 <times/>
                                 <ci>R</ci>
                                 <ci>T</ci>
                              </apply>
                           </apply>
                        </apply>
                     </apply>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.341</cn>
                        <ci>Cao</ci>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <minus/>
                  <apply>
                     <exp/>
                     <apply>
                        <divide/>
                        <apply>
                           <times/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                           <ci>V</ci>
                           <ci>F</ci>
                        </apply>
                        <apply>
                           <times/>
                           <ci>R</ci>
                           <ci>T</ci>
                        </apply>
                     </apply>
                  </apply>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>alpha</ci>
            <apply>
               <times/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">400</cn>
               <apply>
                  <exp/>
                  <apply>
                     <divide/>
                     <apply>
                        <plus/>
                        <ci>V</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">2</cn>
                     </apply>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">10</cn>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta</ci>
            <apply>
               <times/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">50</cn>
               <apply>
                  <exp/>
                  <apply>
                     <divide/>
                     <apply>
                        <minus/>
                        <apply>
                           <plus/>
                           <ci>V</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">2</cn>
                        </apply>
                     </apply>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">13</cn>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>alpha_a</ci>
            <apply>
               <times/>
               <ci>alpha</ci>
               <ci>a</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_b</ci>
            <apply>
               <divide/>
               <ci>beta</ci>
               <ci>b</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>gamma</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_second">103.75</cn>
                  <ci>Ca_ss</ci>
               </apply>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">1</cn>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C0</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <ci>beta</ci>
                     <ci>C1</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>omega</ci>
                     <ci>C_Ca0</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        <ci>alpha</ci>
                     </apply>
                     <ci>gamma</ci>
                  </apply>
                  <ci>C0</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C1</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     <ci>alpha</ci>
                     <ci>C0</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     <ci>beta</ci>
                     <ci>C2</ci>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <ci>b</ci>
                     </apply>
                     <ci>C_Ca1</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <ci>beta</ci>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        <ci>alpha</ci>
                     </apply>
                     <apply>
                        <times/>
                        <ci>gamma</ci>
                        <ci>a</ci>
                     </apply>
                  </apply>
                  <ci>C1</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C2</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     <ci>alpha</ci>
                     <ci>C1</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     <ci>beta</ci>
                     <ci>C3</ci>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                     </apply>
                     <ci>C_Ca2</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        <ci>alpha</ci>
                     </apply>
                     <apply>
                        <times/>
                        <ci>gamma</ci>
                        <apply>
                           <power/>
                           <ci>a</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C2</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C3</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     <ci>alpha</ci>
                     <ci>C2</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     <ci>beta</ci>
                     <ci>C4</ci>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        </apply>
                     </apply>
                     <ci>C_Ca3</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <ci>alpha</ci>
                     <apply>
                        <times/>
                        <ci>gamma</ci>
                        <apply>
                           <power/>
                           <ci>a</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C3</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C4</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <ci>alpha</ci>
                     <ci>C3</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>g</ci>
                     <ci>O</ci>
                  </apply>
                  <apply>
                     <times/>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        </apply>
                     </apply>
                     <ci>C_Ca4</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     </apply>
                     <ci>f</ci>
                     <apply>
                        <times/>
                        <ci>gamma</ci>
                        <apply>
                           <power/>
                           <ci>a</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C4</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>O</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>f</ci>
                  <ci>C4</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>g</ci>
                  <ci>O</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C_Ca0</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <ci>beta_b</ci>
                     <ci>C_Ca1</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gamma</ci>
                     <ci>C0</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        <ci>alpha_a</ci>
                     </apply>
                     <ci>omega</ci>
                  </apply>
                  <ci>C_Ca0</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C_Ca1</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     <ci>alpha_a</ci>
                     <ci>C_Ca0</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     <ci>beta_b</ci>
                     <ci>C_Ca2</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gamma</ci>
                     <ci>a</ci>
                     <ci>C1</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <ci>beta_b</ci>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        <ci>alpha_a</ci>
                     </apply>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <ci>b</ci>
                     </apply>
                  </apply>
                  <ci>C_Ca1</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C_Ca2</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     <ci>alpha_a</ci>
                     <ci>C_Ca1</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     <ci>beta_b</ci>
                     <ci>C_Ca3</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gamma</ci>
                     <apply>
                        <power/>
                        <ci>a</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                     <ci>C2</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta_b</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        <ci>alpha_a</ci>
                     </apply>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C_Ca2</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C_Ca3</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     <ci>alpha_a</ci>
                     <ci>C_Ca2</ci>
                  </apply>
                  <apply>
                     <times/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     <ci>beta_b</ci>
                     <ci>C_Ca4</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gamma</ci>
                     <apply>
                        <power/>
                        <ci>a</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <ci>C3</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta_b</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <ci>alpha_a</ci>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C_Ca3</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>C_Ca4</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <plus/>
                  <apply>
                     <times/>
                     <ci>alpha_a</ci>
                     <ci>C_Ca3</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gprime</ci>
                     <ci>O_Ca</ci>
                  </apply>
                  <apply>
                     <times/>
                     <ci>gamma</ci>
                     <apply>
                        <power/>
                        <ci>a</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     </apply>
                     <ci>C4</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>beta_b</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                     </apply>
                     <ci>fprime</ci>
                     <apply>
                        <divide/>
                        <ci>omega</ci>
                        <apply>
                           <power/>
                           <ci>b</ci>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">4</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>C_Ca4</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>O_Ca</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>fprime</ci>
                  <ci>C_Ca4</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>gprime</ci>
                  <ci>O_Ca</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00045" name="L_type_Ca_current_y_gate">
      <variable initial_value="0.798" name="y" public_interface="out" units="dimensionless"/>
      <variable name="y_infinity" units="dimensionless"/>
      <variable name="tau_y" units="second"/>
      <variable name="V" public_interface="in" units="millivolt"/>
      <variable name="time" public_interface="in" units="second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>y_infinity</ci>
            <apply>
               <plus/>
               <apply>
                  <divide/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.8</cn>
                  <apply>
                     <plus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                     <apply>
                        <exp/>
                        <apply>
                           <divide/>
                           <apply>
                              <plus/>
                              <ci>V</ci>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">12.5</cn>
                           </apply>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">5</cn>
                        </apply>
                     </apply>
                  </apply>
               </apply>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0.2</cn>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>tau_y</ci>
            <apply>
               <divide/>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="second">20</cn>
                  <apply>
                     <divide/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="second">600</cn>
                     <apply>
                        <plus/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                        <apply>
                           <exp/>
                           <apply>
                              <divide/>
                              <apply>
                                 <plus/>
                                 <ci>V</ci>
                                 <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">20</cn>
                              </apply>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millivolt">9.5</cn>
                           </apply>
                        </apply>
                     </apply>
                  </apply>
               </apply>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1000</cn>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>y</ci>
            </apply>
            <apply>
               <divide/>
               <apply>
                  <minus/>
                  <ci>y_infinity</ci>
                  <ci>y</ci>
               </apply>
               <ci>tau_y</ci>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00069" name="RyR_channel">
      <variable cmeta:id="RyR_channel_J_rel" name="J_rel" public_interface="out" units="millimolar_per_second"/>
      <variable initial_value="1800" name="v1" units="per_second"/>
      <variable initial_value="1.215e13" name="k_a_plus" units="millimolar4_per_second"/>
      <variable initial_value="576" name="k_a_minus" units="per_second"/>
      <variable initial_value="4.05e9" name="k_b_plus" units="millimolar3_per_second"/>
      <variable initial_value="1930" name="k_b_minus" units="per_second"/>
      <variable initial_value="100" name="k_c_plus" units="per_second"/>
      <variable initial_value="0.8" name="k_c_minus" units="per_second"/>
      <variable initial_value="0" name="P_O1" units="dimensionless"/>
      <variable initial_value="0" name="P_O2" units="dimensionless"/>
      <variable initial_value="0.47" name="P_C1" units="dimensionless"/>
      <variable initial_value="0.53" name="P_C2" units="dimensionless"/>
      <variable initial_value="4" name="n" units="dimensionless"/>
      <variable initial_value="3" name="m" units="dimensionless"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="Ca_ss" public_interface="in" units="millimolar"/>
      <variable name="Ca_JSR" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>P_C1</ci>
            </apply>
            <apply>
               <plus/>
               <apply>
                  <times/>
                  <apply>
                     <minus/>
                     <ci>k_a_plus</ci>
                  </apply>
                  <apply>
                     <power/>
                     <ci>Ca_ss</ci>
                     <ci>n</ci>
                  </apply>
                  <ci>P_C1</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>k_a_minus</ci>
                  <ci>P_O1</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>P_O1</ci>
            </apply>
            <apply>
               <plus/>
               <apply>
                  <minus/>
                  <apply>
                     <times/>
                     <ci>k_a_plus</ci>
                     <apply>
                        <power/>
                        <ci>Ca_ss</ci>
                        <ci>n</ci>
                     </apply>
                     <ci>P_C1</ci>
                  </apply>
                  <apply>
                     <plus/>
                     <apply>
                        <times/>
                        <ci>k_a_minus</ci>
                        <ci>P_O1</ci>
                     </apply>
                     <apply>
                        <times/>
                        <ci>k_b_plus</ci>
                        <apply>
                           <power/>
                           <ci>Ca_ss</ci>
                           <ci>m</ci>
                        </apply>
                        <ci>P_O1</ci>
                     </apply>
                     <apply>
                        <times/>
                        <ci>k_c_plus</ci>
                        <ci>P_O1</ci>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>k_b_minus</ci>
                  <ci>P_O2</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>k_c_minus</ci>
                  <ci>P_C2</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>P_O2</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>k_b_plus</ci>
                  <apply>
                     <power/>
                     <ci>Ca_ss</ci>
                     <ci>m</ci>
                  </apply>
                  <ci>P_O1</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>k_b_minus</ci>
                  <ci>P_O2</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>P_C2</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>k_c_plus</ci>
                  <ci>P_O1</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>k_c_minus</ci>
                  <ci>P_C2</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_rel</ci>
            <apply>
               <times/>
               <ci>v1</ci>
               <apply>
                  <plus/>
                  <ci>P_O1</ci>
                  <ci>P_O2</ci>
               </apply>
               <apply>
                  <minus/>
                  <ci>Ca_JSR</ci>
                  <ci>Ca_ss</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00068" name="SERCA2a_pump">
      <variable cmeta:id="SERCA2a_pump_J_up" name="J_up" public_interface="out" units="millimolar_per_second"/>
      <variable initial_value="0.000168" name="K_fb" units="millimolar"/>
      <variable initial_value="3.29" name="K_rb" units="millimolar"/>
      <variable name="fb" units="dimensionless"/>
      <variable name="rb" units="dimensionless"/>
      <variable initial_value="0.0813" name="Vmaxf" units="millimolar_per_second"/>
      <variable initial_value="0.318" name="Vmaxr" units="millimolar_per_second"/>
      <variable initial_value="1" name="K_SR" units="dimensionless"/>
      <variable initial_value="1.2" name="N_fb" units="dimensionless"/>
      <variable initial_value="1" name="N_rb" units="dimensionless"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="Cai" public_interface="in" units="millimolar"/>
      <variable name="Ca_NSR" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>fb</ci>
            <apply>
               <power/>
               <apply>
                  <divide/>
                  <ci>Cai</ci>
                  <ci>K_fb</ci>
               </apply>
               <ci>N_fb</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>rb</ci>
            <apply>
               <power/>
               <apply>
                  <divide/>
                  <ci>Ca_NSR</ci>
                  <ci>K_rb</ci>
               </apply>
               <ci>N_rb</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_up</ci>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <ci>K_SR</ci>
                  <apply>
                     <minus/>
                     <apply>
                        <times/>
                        <ci>Vmaxf</ci>
                        <ci>fb</ci>
                     </apply>
                     <apply>
                        <times/>
                        <ci>Vmaxr</ci>
                        <ci>rb</ci>
                     </apply>
                  </apply>
               </apply>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <ci>fb</ci>
                  <ci>rb</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00046" name="intracellular_Ca_fluxes">
      <variable cmeta:id="intracellular_Ca_fluxes_J_tr" name="J_tr" public_interface="out" units="millimolar_per_second"/>
      <variable cmeta:id="intracellular_Ca_fluxes_J_xfer" name="J_xfer" public_interface="out" units="millimolar_per_second"/>
      <variable cmeta:id="id_00070" name="J_trpn" public_interface="out" units="millimolar_per_second"/>
      <variable initial_value="0.0005747" name="tau_tr" units="second"/>
      <variable initial_value="0.0267" name="tau_xfer" units="second"/>
      <variable cmeta:id="id_00071" initial_value="0.98" name="HTRPNCa" units="millimolar"/>
      <variable cmeta:id="id_00072" initial_value="0.078" name="LTRPNCa" units="millimolar"/>
      <variable cmeta:id="id_00073" name="J_HTRPNCa" units="millimolar_per_second"/>
      <variable cmeta:id="id_00074" name="J_LTRPNCa" units="millimolar_per_second"/>
      <variable initial_value="0.14" name="HTRPN_tot" units="dimensionless"/>
      <variable initial_value="0.07" name="LTRPN_tot" units="dimensionless"/>
      <variable cmeta:id="id_00075" initial_value="20000" name="k_htrpn_plus" units="per_millimolar_second"/>
      <variable cmeta:id="id_00076" initial_value="0.066" name="k_htrpn_minus" units="per_second"/>
      <variable cmeta:id="id_00077" initial_value="40000" name="k_ltrpn_plus" units="per_millimolar_second"/>
      <variable cmeta:id="id_00078" initial_value="40" name="k_ltrpn_minus" units="per_second"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="Ca_ss" public_interface="in" units="millimolar"/>
      <variable name="Cai" public_interface="in" units="millimolar"/>
      <variable name="Ca_NSR" public_interface="in" units="millimolar"/>
      <variable name="Ca_JSR" public_interface="in" units="millimolar"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <ci>J_tr</ci>
            <apply>
               <divide/>
               <apply>
                  <minus/>
                  <ci>Ca_NSR</ci>
                  <ci>Ca_JSR</ci>
               </apply>
               <ci>tau_tr</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_xfer</ci>
            <apply>
               <divide/>
               <apply>
                  <minus/>
                  <ci>Ca_ss</ci>
                  <ci>Cai</ci>
               </apply>
               <ci>tau_xfer</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_trpn</ci>
            <apply>
               <plus/>
               <apply>
                  <times/>
                  <ci>HTRPN_tot</ci>
                  <ci>J_HTRPNCa</ci>
               </apply>
               <apply>
                  <times/>
                  <ci>LTRPN_tot</ci>
                  <ci>J_LTRPNCa</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_HTRPNCa</ci>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>HTRPNCa</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>HTRPNCa</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>k_htrpn_plus</ci>
                  <ci>Cai</ci>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">1</cn>
                     <ci>HTRPNCa</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>k_htrpn_minus</ci>
                  <ci>HTRPNCa</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>J_LTRPNCa</ci>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>LTRPNCa</ci>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>LTRPNCa</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <times/>
                  <ci>k_ltrpn_plus</ci>
                  <ci>Cai</ci>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="millimolar">1</cn>
                     <ci>LTRPNCa</ci>
                  </apply>
               </apply>
               <apply>
                  <times/>
                  <ci>k_ltrpn_minus</ci>
                  <ci>LTRPNCa</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00083" name="intracellular_ion_concentrations">
      <variable cmeta:id="id_00084" initial_value="10" name="Nai" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00086" initial_value="0.00008" name="Cai" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00085" initial_value="157.8" name="Ki" public_interface="out" units="millimolar"/>
      <variable initial_value="0.00011" name="Ca_ss" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00087" initial_value="0.257" name="Ca_JSR" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00088" initial_value="0.257" name="Ca_NSR" public_interface="out" units="millimolar"/>
      <variable initial_value="0.0001534" name="A_cap" units="cm2"/>
      <variable initial_value="0.00002584" name="V_myo" units="micro_litre"/>
      <variable cmeta:id="id_00089" initial_value="0.00000016" name="V_JSR" units="micro_litre"/>
      <variable cmeta:id="id_00090" initial_value="0.0000021" name="V_NSR" units="micro_litre"/>
      <variable initial_value="0.0000000012" name="V_SS" units="micro_litre"/>
      <variable cmeta:id="intracellular_ion_concentrations_K_mCMDN" initial_value="0.00238" name="K_mCMDN" units="millimolar"/>
      <variable cmeta:id="id_00093" initial_value="0.00015" name="K_mEGTA" units="millimolar"/>
      <variable cmeta:id="intracellular_ion_concentrations_K_mCSQN" initial_value="0.8" name="K_mCSQN" units="millimolar"/>
      <variable cmeta:id="id_00091" initial_value="0.05" name="CMDN_tot" units="millimolar"/>
      <variable cmeta:id="id_00092" initial_value="0" name="EGTA_tot" units="millimolar"/>
      <variable cmeta:id="id_00094" initial_value="15" name="CSQN_tot" units="millimolar"/>
      <variable name="beta_i" units="dimensionless"/>
      <variable name="beta_SS" units="dimensionless"/>
      <variable name="beta_JSR" units="dimensionless"/>
      <variable name="time" public_interface="in" units="second"/>
      <variable name="F" public_interface="in" units="coulomb_per_millimole"/>
      <variable name="C_sc" public_interface="in" units="microF_per_cm2"/>
      <variable cmeta:id="id_00060" name="i_Na" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00047" name="i_Ca" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00061" name="i_Na_b" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00095" name="i_NaCa" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00033" name="i_NaK" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00096" name="i_Ca_K" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00062" name="i_Kr" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00063" name="i_Ks" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00097" name="i_K1" public_interface="in" units="microA_per_microF"/>
      <variable name="i_Kp" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00098" name="i_to1" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00048" name="i_p_Ca" public_interface="in" units="microA_per_microF"/>
      <variable cmeta:id="id_00049" name="i_Ca_b" public_interface="in" units="microA_per_microF"/>
      <variable name="J_up" public_interface="in" units="millimolar_per_second"/>
      <variable name="J_rel" public_interface="in" units="millimolar_per_second"/>
      <variable name="J_xfer" public_interface="in" units="millimolar_per_second"/>
      <variable cmeta:id="id_00099" name="J_trpn" public_interface="in" units="millimolar_per_second"/>
      <variable name="J_tr" public_interface="in" units="millimolar_per_second"/>
      <math xmlns="http://www.w3.org/1998/Math/MathML">
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Cai</ci>
            </apply>
            <apply>
               <times/>
               <ci>beta_i</ci>
               <apply>
                  <plus/>
                  <apply>
                     <minus/>
                     <ci>J_xfer</ci>
                     <apply>
                        <plus/>
                        <ci>J_up</ci>
                        <ci>J_trpn</ci>
                     </apply>
                  </apply>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <apply>
                           <minus/>
                           <apply>
                              <times/>
                              <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                              <ci>i_NaCa</ci>
                           </apply>
                           <apply>
                              <plus/>
                              <ci>i_p_Ca</ci>
                              <ci>i_Ca_b</ci>
                           </apply>
                        </apply>
                        <ci>A_cap</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
                     </apply>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        <ci>V_myo</ci>
                        <ci>F</ci>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Nai</ci>
            </apply>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0</cn>
                  </apply>
                  <apply>
                     <plus/>
                     <ci>i_Na</ci>
                     <ci>i_Na_b</ci>
                     <apply>
                        <times/>
                        <ci>i_NaCa</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                     <apply>
                        <times/>
                        <ci>i_NaK</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">3</cn>
                     </apply>
                  </apply>
                  <ci>A_cap</ci>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
               </apply>
               <apply>
                  <times/>
                  <ci>V_myo</ci>
                  <ci>F</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Ki</ci>
            </apply>
            <apply>
               <divide/>
               <apply>
                  <times/>
                  <apply>
                     <minus/>
                     <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">0</cn>
                  </apply>
                  <apply>
                     <plus/>
                     <ci>i_Ca_K</ci>
                     <ci>i_Kr</ci>
                     <ci>i_Ks</ci>
                     <ci>i_K1</ci>
                     <ci>i_Kp</ci>
                     <ci>i_to1</ci>
                     <apply>
                        <times/>
                        <ci>i_NaK</ci>
                        <apply>
                           <minus/>
                           <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        </apply>
                     </apply>
                  </apply>
                  <ci>A_cap</ci>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
               </apply>
               <apply>
                  <times/>
                  <ci>V_myo</ci>
                  <ci>F</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_i</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>CMDN_tot</ci>
                        <ci>K_mCMDN</ci>
                     </apply>
                     <apply>
                        <power/>
                        <apply>
                           <plus/>
                           <ci>K_mCMDN</ci>
                           <ci>Cai</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                  </apply>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>EGTA_tot</ci>
                        <ci>K_mEGTA</ci>
                     </apply>
                     <apply>
                        <power/>
                        <apply>
                           <plus/>
                           <ci>K_mEGTA</ci>
                           <ci>Cai</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_SS</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>CMDN_tot</ci>
                        <ci>K_mCMDN</ci>
                     </apply>
                     <apply>
                        <power/>
                        <apply>
                           <plus/>
                           <ci>K_mCMDN</ci>
                           <ci>Ca_ss</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                  </apply>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>EGTA_tot</ci>
                        <ci>K_mEGTA</ci>
                     </apply>
                     <apply>
                        <power/>
                        <apply>
                           <plus/>
                           <ci>K_mEGTA</ci>
                           <ci>Ca_ss</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <ci>beta_JSR</ci>
            <apply>
               <divide/>
               <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
               <apply>
                  <plus/>
                  <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">1</cn>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>CSQN_tot</ci>
                        <ci>K_mCSQN</ci>
                     </apply>
                     <apply>
                        <power/>
                        <apply>
                           <plus/>
                           <ci>K_mCSQN</ci>
                           <ci>Ca_JSR</ci>
                        </apply>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Ca_ss</ci>
            </apply>
            <apply>
               <times/>
               <ci>beta_SS</ci>
               <apply>
                  <minus/>
                  <apply>
                     <minus/>
                     <apply>
                        <divide/>
                        <apply>
                           <times/>
                           <ci>J_rel</ci>
                           <ci>V_JSR</ci>
                        </apply>
                        <ci>V_SS</ci>
                     </apply>
                     <apply>
                        <divide/>
                        <apply>
                           <times/>
                           <ci>J_xfer</ci>
                           <ci>V_myo</ci>
                        </apply>
                        <ci>V_SS</ci>
                     </apply>
                  </apply>
                  <apply>
                     <divide/>
                     <apply>
                        <times/>
                        <ci>i_Ca</ci>
                        <ci>A_cap</ci>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="microF_per_cm2">1</cn>
                     </apply>
                     <apply>
                        <times/>
                        <cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless">2</cn>
                        <ci>V_SS</ci>
                        <ci>F</ci>
                     </apply>
                  </apply>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Ca_JSR</ci>
            </apply>
            <apply>
               <times/>
               <ci>beta_JSR</ci>
               <apply>
                  <minus/>
                  <ci>J_tr</ci>
                  <ci>J_rel</ci>
               </apply>
            </apply>
         </apply>
         <apply>
            <eq/>
            <apply>
               <diff/>
               <bvar>
                  <ci>time</ci>
               </bvar>
               <ci>Ca_NSR</ci>
            </apply>
            <apply>
               <minus/>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>J_up</ci>
                     <ci>V_myo</ci>
                  </apply>
                  <ci>V_NSR</ci>
               </apply>
               <apply>
                  <divide/>
                  <apply>
                     <times/>
                     <ci>J_tr</ci>
                     <ci>V_JSR</ci>
                  </apply>
                  <ci>V_NSR</ci>
               </apply>
            </apply>
         </apply>
      </math>
   </component>
   <component cmeta:id="id_00079" name="standard_ionic_concentrations">
      <variable cmeta:id="id_00082" initial_value="138" name="Nao" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00081" initial_value="2" name="Cao" public_interface="out" units="millimolar"/>
      <variable cmeta:id="id_00080" initial_value="4" name="Ko" public_interface="out" units="millimolar"/>
   </component>
   <group>
      <relationship_ref relationship="containment"/>
      <component_ref component="membrane">
         <component_ref component="fast_sodium_current">
            <component_ref component="fast_sodium_current_m_gate"/>
            <component_ref component="fast_sodium_current_h_gate"/>
            <component_ref component="fast_sodium_current_j_gate"/>
         </component_ref>
         <component_ref component="rapid_activating_delayed_rectifiyer_K_current">
            <component_ref component="rapid_activating_delayed_rectifiyer_K_current_X_kr_gate"/>
         </component_ref>
         <component_ref component="slow_activating_delayed_rectifiyer_K_current">
            <component_ref component="slow_activating_delayed_rectifiyer_K_current_X_ks_gate"/>
         </component_ref>
         <component_ref component="transient_outward_potassium_current">
            <component_ref component="transient_outward_potassium_current_X_to1_gate"/>
            <component_ref component="transient_outward_potassium_current_Y_to1_gate"/>
         </component_ref>
         <component_ref component="time_independent_potassium_current">
            <component_ref component="time_independent_potassium_current_K1_gate"/>
         </component_ref>
         <component_ref component="plateau_potassium_current">
            <component_ref component="plateau_potassium_current_Kp_gate"/>
         </component_ref>
         <component_ref component="Na_Ca_exchanger"/>
         <component_ref component="sodium_potassium_pump"/>
         <component_ref component="sarcolemmal_calcium_pump"/>
         <component_ref component="calcium_background_current"/>
         <component_ref component="sodium_background_current"/>
         <component_ref component="L_type_Ca_current">
            <component_ref component="L_type_Ca_current_y_gate"/>
         </component_ref>
         <component_ref component="RyR_channel"/>
         <component_ref component="SERCA2a_pump"/>
         <component_ref component="intracellular_Ca_fluxes"/>
         <component_ref component="intracellular_ion_concentrations"/>
         <component_ref component="standard_ionic_concentrations"/>
      </component_ref>
   </group>
   <group>
      <relationship_ref relationship="encapsulation"/>
      <component_ref component="fast_sodium_current">
         <component_ref component="fast_sodium_current_m_gate"/>
         <component_ref component="fast_sodium_current_h_gate"/>
         <component_ref component="fast_sodium_current_j_gate"/>
      </component_ref>
      <component_ref component="rapid_activating_delayed_rectifiyer_K_current">
         <component_ref component="rapid_activating_delayed_rectifiyer_K_current_X_kr_gate"/>
      </component_ref>
      <component_ref component="slow_activating_delayed_rectifiyer_K_current">
         <component_ref component="slow_activating_delayed_rectifiyer_K_current_X_ks_gate"/>
      </component_ref>
      <component_ref component="transient_outward_potassium_current">
         <component_ref component="transient_outward_potassium_current_X_to1_gate"/>
         <component_ref component="transient_outward_potassium_current_Y_to1_gate"/>
      </component_ref>
      <component_ref component="time_independent_potassium_current">
         <component_ref component="time_independent_potassium_current_K1_gate"/>
      </component_ref>
      <component_ref component="plateau_potassium_current">
         <component_ref component="plateau_potassium_current_Kp_gate"/>
      </component_ref>
      <component_ref component="L_type_Ca_current">
         <component_ref component="L_type_Ca_current_y_gate"/>
      </component_ref>
   </group>
   <connection>
      <map_components component_1="membrane" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="fast_sodium_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="rapid_activating_delayed_rectifiyer_K_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="slow_activating_delayed_rectifiyer_K_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="transient_outward_potassium_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="time_independent_potassium_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="plateau_potassium_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="Na_Ca_exchanger" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="sodium_potassium_pump" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="sarcolemmal_calcium_pump" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="calcium_background_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="sodium_background_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="L_type_Ca_current" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="RyR_channel" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="SERCA2a_pump" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="intracellular_Ca_fluxes" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="intracellular_ion_concentrations" component_2="environment"/>
      <map_variables variable_1="time" variable_2="time"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="fast_sodium_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
      <map_variables variable_1="i_Na" variable_2="i_Na"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Kr" variable_2="i_Kr"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="slow_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Ks" variable_2="i_Ks"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="transient_outward_potassium_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_to1" variable_2="i_to1"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="time_independent_potassium_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_K1" variable_2="i_K1"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="plateau_potassium_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Kp" variable_2="i_Kp"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="Na_Ca_exchanger"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_NaCa" variable_2="i_NaCa"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="sodium_potassium_pump"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_NaK" variable_2="i_NaK"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="sarcolemmal_calcium_pump"/>
      <map_variables variable_1="i_p_Ca" variable_2="i_p_Ca"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="calcium_background_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Ca_b" variable_2="i_Ca_b"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="sodium_background_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Na_b" variable_2="i_Na_b"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="L_type_Ca_current"/>
      <map_variables variable_1="V" variable_2="V"/>
      <map_variables variable_1="i_Ca" variable_2="i_Ca"/>
      <map_variables variable_1="i_Ca_K" variable_2="i_Ca_K"/>
      <map_variables variable_1="R" variable_2="R"/>
      <map_variables variable_1="T" variable_2="T"/>
      <map_variables variable_1="F" variable_2="F"/>
      <map_variables variable_1="C_sc" variable_2="C_sc"/>
   </connection>
   <connection>
      <map_components component_1="membrane" component_2="intracellular_ion_concentrations"/>
      <map_variables variable_1="F" variable_2="F"/>
      <map_variables variable_1="C_sc" variable_2="C_sc"/>
   </connection>
   <connection>
      <map_components component_1="fast_sodium_current" component_2="intracellular_ion_concentrations"/>
      <map_variables variable_1="i_Na" variable_2="i_Na"/>
      <map_variables variable_1="Nai" variable_2="Nai"/>
   </connection>
   <connection>
      <map_components component_1="fast_sodium_current" component_2="sodium_background_current"/>
      <map_variables variable_1="E_Na" variable_2="E_Na"/>
   </connection>
   <connection>
      <map_components component_1="fast_sodium_current" component_2="standard_ionic_concentrations"/>
      <map_variables variable_1="Nao" variable_2="Nao"/>
   </connection>
   <connection>
      <map_components component_1="intracellular_ion_concentrations" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="i_Kr" variable_2="i_Kr"/>
      <map_variables variable_1="Ki" variable_2="Ki"/>
   </connection>
   <connection>
      <map_components component_1="standard_ionic_concentrations" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="Ko" variable_2="Ko"/>
   </connection>
   <connection>
      <map_components component_1="transient_outward_potassium_current" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="E_K" variable_2="E_K"/>
   </connection>
   <connection>
      <map_components component_1="time_independent_potassium_current" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="E_K" variable_2="E_K"/>
   </connection>
   <connection>
      <map_components component_1="plateau_potassium_current" component_2="rapid_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="E_K" variable_2="E_K"/>
   </connection>
   <connection>
      <map_components component_1="intracellular_ion_concentrations" component_2="slow_activating_delayed_rectifiyer_K_current"/>
      <map_variables variable_1="i_Ks" variable_2="i_Ks"/>
      <map_variables variable_1="Ki" variable_2="Ki"/>
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