<?xml version="1.0"?>
<model xmlns="http://www.cellml.org/cellml/1.0#" xmlns:cellml="http://www.cellml.org/cellml/1.0#" xmlns:cmeta="http://www.cellml.org/metadata/1.0#" cmeta:id="1962_noble_freeRunning" name="1962_noble_freeRunning">
<units base_units="no" name="mm">
<unit prefix="milli" units="metre"/>
</units>
<units base_units="no" name="ng">
<unit prefix="nano" units="gram"/>
</units>
<units base_units="no" name="ms">
<unit prefix="milli" units="second"/>
</units>
<units base_units="no" name="uA">
<unit prefix="micro" units="ampere"/>
</units>
<units base_units="no" name="K">
<unit units="kelvin"/>
</units>
<units base_units="no" name="nmol">
<unit prefix="nano" units="mole"/>
</units>
<units base_units="no" name="mmsq">
<unit exponent="2" units="mm"/>
</units>
<units base_units="no" name="mmcu">
<unit exponent="3" units="mm"/>
</units>
<units base_units="no" name="mssq">
<unit exponent="2" units="ms"/>
</units>
<units base_units="no" name="mscu">
<unit exponent="3" units="ms"/>
</units>
<units base_units="no" name="mV">
<unit prefix="milli" units="volt"/>
</units>
<units base_units="no" name="mVsq">
<unit exponent="2" units="mV"/>
</units>
<units base_units="no" name="mV_per_ms">
<unit units="mV"/>
<unit exponent="-1" units="ms"/>
</units>
<units base_units="no" name="mS">
<unit prefix="milli" units="siemens"/>
</units>
<units base_units="no" name="mS_per_mmsq">
<unit units="mS"/>
<unit exponent="-2" units="mm"/>
</units>
<units base_units="no" name="mS_per_mm">
<unit units="mS"/>
<unit exponent="-1" units="mm"/>
</units>
<units base_units="no" name="uA_per_mmsq">
<unit units="uA"/>
<unit exponent="-2" units="mm"/>
</units>
<units base_units="no" name="uA_per_mmcu">
<unit units="uA"/>
<unit exponent="-3" units="mm"/>
</units>
<units base_units="no" name="nC">
<unit prefix="nano" units="coulomb"/>
</units>
<units base_units="no" name="uF">
<unit prefix="micro" units="farad"/>
</units>
<units base_units="no" name="uF_per_mmsq">
<unit units="uF"/>
<unit exponent="-2" units="mm"/>
</units>
<units base_units="no" name="mM">
<unit units="nmol"/>
<unit exponent="-3" units="mm"/>
</units>
<units base_units="no" name="mM_per_ms">
<unit units="mM"/>
<unit exponent="-1" units="ms"/>
</units>
<units base_units="no" name="nN">
<unit prefix="nano" units="newton"/>
</units>
<units base_units="no" name="mPa">
<unit prefix="milli" units="pascal"/>
</units>
<units base_units="no" name="pJ">
<unit prefix="pico" units="joule"/>
</units>
<units base_units="no" name="nW">
<unit prefix="nano" units="watt"/>
</units>
<units base_units="no" name="per_ms">
<unit exponent="-1" units="ms"/>
</units>
<units base_units="no" name="per_mm">
<unit exponent="-1" units="mm"/>
</units>
<units base_units="no" name="per_mV">
<unit exponent="-1" units="mV"/>
</units>
<units base_units="no" name="per_mV_per_ms">
<unit exponent="-1" units="mV"/>
<unit units="per_ms"/>
</units>
<units base_units="no" name="per_mM_per_ms">
<unit exponent="-1" units="mM"/>
<unit units="per_ms"/>
</units>
<units base_units="no" name="uA_per_mmsq_per_mM">
<unit units="uA"/>
<unit exponent="-2" units="mm"/>
<unit exponent="-1" units="mM"/>
</units>
<units base_units="no" name="mm_per_ms"/>
<units base_units="no" name="gas_constant">
<unit units="pJ"/>
<unit exponent="-1" units="nmol"/>
<unit exponent="-1" units="K"/>
</units>
<units base_units="no" name="faradays_constant">
<unit units="nC"/>
<unit exponent="-1" units="nmol"/>
</units>
<units base_units="no" name="pA_per_pF">
<unit prefix="pico" units="ampere"/>
<unit exponent="-1" prefix="pico" units="farad"/>
</units>
<units base_units="no" name="nS_per_pF">
<unit prefix="nano" units="siemens"/>
<unit exponent="-1" prefix="pico" units="farad"/>
</units>
<units base_units="no" name="uF_per_cmsq">
<unit prefix="micro" units="farad"/>
<unit exponent="-2" prefix="centi" units="metre"/>
</units>
<units base_units="no" name="um">
<unit prefix="micro" units="metre"/>
</units>
<units base_units="no" name="umsq">
<unit exponent="2" prefix="micro" units="metre"/>
</units>
<units base_units="no" name="umcu">
<unit exponent="3" prefix="micro" units="metre"/>
</units>
<units base_units="no" name="cmcu_per_uF_per_s">
<unit exponent="3" prefix="centi" units="metre"/>
<unit exponent="-1" prefix="micro" units="farad"/>
<unit exponent="-1" units="second"/>
</units>
<units base_units="no" name="mM_per_s">
<unit units="mM"/>
<unit exponent="-1" units="second"/>
</units>
<units base_units="no" name="per_mV_ms">
<unit exponent="-1" units="mV"/>
<unit exponent="-1" units="ms"/>
</units>
<units base_units="no" name="mS_per_mm2">
<unit prefix="milli" units="siemens"/>
<unit exponent="-2" prefix="milli" units="metre"/>
</units>
<units base_units="no" name="uF_per_mm2">
<unit prefix="micro" units="farad"/>
<unit exponent="-2" prefix="milli" units="metre"/>
</units>
<units base_units="no" name="uA_per_mm2">
<unit prefix="micro" units="ampere"/>
<unit exponent="-2" prefix="milli" units="metre"/>
</units>
<component cmeta:id="time_component" name="time">
<variable cmeta:id="time" initial_value="0.0" name="time" public_interface="out" units="ms"/>
</component>
<component cmeta:id="stimulus_protocol" name="stimulus_protocol">
<variable name="IStim" initial_value="0.0" public_interface="out" units="uA_per_mmsq"/>
<variable name="time" public_interface="in" units="ms"/>
</component>
<component cmeta:id="parameters" name="parameters">
<variable initial_value="0.0" name="g_K_add" public_interface="out" units="mS_per_mmsq"/>
</component>
<component cmeta:id="interface" name="model">
<variable name="time" private_interface="out" public_interface="in" units="ms"/>
<variable name="I_stim" private_interface="out" public_interface="in" units="uA_per_mm2"/>
<variable name="g_K_add" private_interface="out" public_interface="in" units="mS_per_mm2"/>
</component>
<component cmeta:id="membrane" name="membrane">
<variable cmeta:id="Vm" initial_value="-73.8" name="V" public_interface="out" units="mV"/>
<variable initial_value="0.12" name="Cm" units="uF_per_mm2"/>
<variable name="time" public_interface="in" units="ms"/>
<variable name="i_Na" public_interface="in" units="uA_per_mm2"/>
<variable name="i_K" public_interface="in" units="uA_per_mm2"/>
<variable name="i_Leak" public_interface="in" units="uA_per_mm2"/>
<variable name="I_stim" public_interface="in" units="uA_per_mm2"/>
<variable name="IStimC" public_interface="out" units="uA_per_mm2"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="membrane_voltage_diff_eq">
<apply id="membrane_voltage_diff_eq">
<eq/>
<apply>
<diff/>
<bvar>
<ci> time </ci>
</bvar>
<ci> V </ci>
</apply>
<apply>
<divide/>
<apply>
<minus/>
<ci>I_stim</ci>
<apply>
<plus/>
<ci> i_Na </ci>
<ci> i_K </ci>
<ci> i_Leak </ci>
</apply>
</apply>
<ci> Cm </ci>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="IStim_for_cmiss_eq">
<apply id="IStim_for_cmiss">
<eq/>
<ci>IStimC</ci>
<ci>I_stim</ci>
</apply>
</math>
</component>
<component cmeta:id="sodium_channel" name="sodium_channel">
<variable name="i_Na" public_interface="out" units="uA_per_mm2"/>
<variable initial_value="4.0" name="g_Na_max" units="mS_per_mm2"/>
<variable name="g_Na" units="mS_per_mm2"/>
<variable initial_value="40.0" name="E_Na" units="mV"/>
<variable name="time" private_interface="out" public_interface="in" units="ms"/>
<variable name="V" private_interface="out" public_interface="in" units="mV"/>
<variable name="m" private_interface="in" units="dimensionless"/>
<variable name="h" private_interface="in" units="dimensionless"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="g_Na_calculation_eq">
<apply id="g_Na_calculation">
<eq/>
<ci> g_Na </ci>
<apply>
<times/>
<apply>
<power/>
<ci> m </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 3.0 </cn>
</apply>
<ci> h </ci>
<ci> g_Na_max </ci>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="i_Na_calculation_eq">
<apply id="i_Na_calculation">
<eq/>
<ci> i_Na </ci>
<apply>
<times/>
<apply>
<plus/>
<apply>
<times/>
<ci> g_Na_max </ci>
<apply>
<power/>
<ci> m </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 3.0 </cn>
</apply>
<ci> h </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mS_per_mm2">0.14e-2</cn>
</apply>
<apply>
<minus/>
<ci> V </ci>
<ci> E_Na </ci>
</apply>
</apply>
</apply>
</math>
</component>
<component cmeta:id="sodium_channel_m_gate" name="sodium_channel_m_gate">
<variable initial_value="0.05" name="m" public_interface="out" units="dimensionless"/>
<variable name="alpha_m" units="per_ms"/>
<variable name="beta_m" units="per_ms"/>
<variable name="V" public_interface="in" units="mV"/>
<variable name="time" public_interface="in" units="ms"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="alpha_m_calculation_eq">
<apply id="alpha_m_calculation">
<eq/>
<ci> alpha_m </ci>
<apply>
<divide/>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_mV_ms"> 0.1 </cn>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 48.0 </cn>
</apply>
</apply>
<apply>
<minus/>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 48.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 15.0 </cn>
</apply>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="beta_m_calculation_eq">
<apply id="beta_m_calculation">
<eq/>
<ci> beta_m </ci>
<apply>
<divide/>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_mV_ms"> 0.12 </cn>
<apply>
<plus/>
<ci> V </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 8.0 </cn>
</apply>
</apply>
<apply>
<minus/>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<plus/>
<ci> V </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 8.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 5.0 </cn>
</apply>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="dm_dt_eq">
<apply id="dm_dt">
<eq/>
<apply>
<diff/>
<bvar>
<ci> time </ci>
</bvar>
<ci> m </ci>
</apply>
<apply>
<minus/>
<apply>
<times/>
<ci> alpha_m </ci>
<apply>
<minus/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
<ci> m </ci>
</apply>
</apply>
<apply>
<times/>
<ci> beta_m </ci>
<ci> m </ci>
</apply>
</apply>
</apply>
</math>
</component>
<component cmeta:id="sodium_channel_h_gate" name="sodium_channel_h_gate">
<variable initial_value="0.785" name="h" public_interface="out" units="dimensionless"/>
<variable name="alpha_h" units="per_ms"/>
<variable name="beta_h" units="per_ms"/>
<variable name="V" public_interface="in" units="mV"/>
<variable name="time" public_interface="in" units="ms"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="alpha_h_calculation_eq">
<apply id="alpha_h_calculation">
<eq/>
<ci> alpha_h </ci>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_ms"> 0.17 </cn>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 90.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 20.0 </cn>
</apply>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="beta_h_calculation_eq">
<apply id="beta_h_calculation">
<eq/>
<ci> beta_h </ci>
<apply>
<divide/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_ms"> 1.0 </cn>
<apply>
<plus/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 42.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 10.0 </cn>
</apply>
</apply>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="dh_dt_eq">
<apply id="dh_dt">
<eq/>
<apply>
<diff/>
<bvar>
<ci> time </ci>
</bvar>
<ci> h </ci>
</apply>
<apply>
<minus/>
<apply>
<times/>
<ci> alpha_h </ci>
<apply>
<minus/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
<ci> h </ci>
</apply>
</apply>
<apply>
<times/>
<ci> beta_h </ci>
<ci> h </ci>
</apply>
</apply>
</apply>
</math>
</component>
<component cmeta:id="potassium_channel" name="potassium_channel">
<variable name="i_K" public_interface="out" units="uA_per_mm2"/>
<variable name="g_K1" units="mS_per_mm2"/>
<variable name="g_K2" units="mS_per_mm2"/>
<variable name="g_K_add" public_interface="in" units="mS_per_mm2"/>
<variable name="time" private_interface="out" public_interface="in" units="ms"/>
<variable name="V" private_interface="out" public_interface="in" units="mV"/>
<variable name="n" private_interface="in" units="dimensionless"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="i_K_calculation_eq">
<apply id="i_K_calculation">
<eq/>
<ci> i_K </ci>
<apply>
<times/>
<apply>
<plus/>
<ci> g_K1 </ci>
<ci> g_K2 </ci>
<ci> g_K_add </ci>
</apply>
<apply>
<plus/>
<ci> V </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 100.0 </cn>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="g_K1_calculation_eq">
<apply id="g_K1_calculation">
<eq/>
<ci> g_K1 </ci>
<apply>
<plus/>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mS_per_mm2"> 1.2e-2 </cn>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 90.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 50.0 </cn>
</apply>
</apply>
</apply>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mS_per_mm2"> 0.015e-2 </cn>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<plus/>
<ci> V </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 90.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 60.0 </cn>
</apply>
</apply>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="g_K2_calculation_eq">
<apply id="g_K2_calculation">
<eq/>
<ci> g_K2 </ci>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mS_per_mm2"> 1.2e-2 </cn>
<apply>
<power/>
<ci> n </ci>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 4.0 </cn>
</apply>
</apply>
</apply>
</math>
</component>
<component cmeta:id="potassium_channel_n_gate" name="potassium_channel_n_gate">
<variable initial_value="0.0935" name="n" public_interface="out" units="dimensionless"/>
<variable name="alpha_n" units="per_ms"/>
<variable name="beta_n" units="per_ms"/>
<variable name="V" public_interface="in" units="mV"/>
<variable name="time" public_interface="in" units="ms"/>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="alpha_n_calculation_eq">
<apply id="alpha_n_calculation">
<eq/>
<ci> alpha_n </ci>
<apply>
<divide/>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_mV_ms"> 0.0001 </cn>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 50.0 </cn>
</apply>
</apply>
<apply>
<minus/>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 50.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 10.0 </cn>
</apply>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="beta_n_calculation_eq">
<apply id="beta_n_calculation">
<eq/>
<ci> beta_n </ci>
<apply>
<times/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="per_ms"> 0.002 </cn>
<apply>
<exp/>
<apply>
<divide/>
<apply>
<minus/>
<apply>
<minus/>
<ci> V </ci>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 90.0 </cn>
</apply>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="mV"> 80.0 </cn>
</apply>
</apply>
</apply>
</apply>
</math>
<math xmlns="http://www.w3.org/1998/Math/MathML" cmeta:id="dn_dt_eq">
<apply id="dn_dt">
<eq/>
<apply>
<diff/>
<bvar>
<ci> time </ci>
</bvar>
<ci> n </ci>
</apply>
<apply>
<minus/>
<apply>
<times/>
<ci> alpha_n </ci>
<apply>
<minus/>
<cn xmlns:cellml="http://www.cellml.org/cellml/1.0#" cellml:units="dimensionless"> 1.0 </cn>
<ci> n </ci>
</apply>
</apply>
<apply>
<times/>
<ci> beta_n </ci>
<ci> n </ci>
</apply>
</apply>
</apply>
</math>
</component>
<component cmeta:id="leakage_current" name="leakage_current">
<variable name="i_Leak" public_interface="out" units="uA_per_mm2"/>
<variable initial_value="0.0" name="g_L" units="mS_per_mm2"/>
<variable initial_value="-60.0" name="E_L" units="mV"/>
<variable name="time" public_interface="in" units="ms"/>
<variable name="V" public_interface="in" units="mV"/>
<math xmlns="http://www.w3.org/1998/Math/MathML">
<apply id="i_Leak_calculation">
<eq/>
<ci> i_Leak </ci>
<apply>
<times/>
<ci> g_L </ci>
<apply>
<minus/>
<ci> V </ci>
<ci> E_L </ci>
</apply>
</apply>
</apply>
</math>
</component>
<connection>
<map_components component_1="model" component_2="time"/>
<map_variables variable_1="time" variable_2="time"/>
</connection>
<connection>
<map_components component_1="model" component_2="stimulus_protocol"/>
<map_variables variable_1="I_stim" variable_2="IStim"/>
</connection>
<connection>
<map_components component_1="time" component_2="stimulus_protocol"/>
<map_variables variable_1="time" variable_2="time"/>
</connection>
<connection>
<map_components component_1="model" component_2="parameters"/>
<map_variables variable_1="g_K_add" variable_2="g_K_add"/>
</connection>
<connection>
<map_components component_1="membrane" component_2="model"/>
<map_variables variable_1="time" variable_2="time"/>
<map_variables variable_1="I_stim" variable_2="I_stim"/>
</connection>
<connection>
<map_components component_1="sodium_channel" component_2="model"/>
<map_variables variable_1="time" variable_2="time"/>
</connection>
<connection>
<map_components component_1="potassium_channel" component_2="model"/>
<map_variables variable_1="time" variable_2="time"/>
<map_variables variable_1="g_K_add" variable_2="g_K_add"/>
</connection>
<connection>
<map_components component_1="leakage_current" component_2="model"/>
<map_variables variable_1="time" variable_2="time"/>
</connection>
<connection>
<map_components component_1="membrane" component_2="sodium_channel"/>
<map_variables variable_1="V" variable_2="V"/>
<map_variables variable_1="i_Na" variable_2="i_Na"/>
</connection>
<connection>
<map_components component_1="membrane" component_2="potassium_channel"/>
<map_variables variable_1="V" variable_2="V"/>
<map_variables variable_1="i_K" variable_2="i_K"/>
</connection>
<connection>
<map_components component_1="membrane" component_2="leakage_current"/>
<map_variables variable_1="V" variable_2="V"/>
<map_variables variable_1="i_Leak" variable_2="i_Leak"/>
</connection>
<connection>
<map_components component_1="sodium_channel" component_2="sodium_channel_m_gate"/>
<map_variables variable_1="m" variable_2="m"/>
<map_variables variable_1="time" variable_2="time"/>
<map_variables variable_1="V" variable_2="V"/>
</connection>
<connection>
<map_components component_1="sodium_channel" component_2="sodium_channel_h_gate"/>
<map_variables variable_1="h" variable_2="h"/>
<map_variables variable_1="time" variable_2="time"/>
<map_variables variable_1="V" variable_2="V"/>
</connection>
<connection>
<map_components component_1="potassium_channel" component_2="potassium_channel_n_gate"/>
<map_variables variable_1="n" variable_2="n"/>
<map_variables variable_1="time" variable_2="time"/>
<map_variables variable_1="V" variable_2="V"/>
</connection>
<group>
<relationship_ref relationship="encapsulation"/>
<component_ref component="model">
<component_ref component="membrane"/>
<component_ref component="sodium_channel">
<component_ref component="sodium_channel_m_gate"/>
<component_ref component="sodium_channel_h_gate"/>
</component_ref>
<component_ref component="potassium_channel">
<component_ref component="potassium_channel_n_gate"/>
</component_ref>
<component_ref component="leakage_current"/>
</component_ref>
</group>
</model>