Model is underconstrained. The following variables couldn't be defined: * R in component membrane * T in component membrane * F in component membrane * Cm in component membrane * I_st in component membrane * i_Na in component fast_sodium_current * i_Ca_L in component L_type_Ca_channel * i_K in component time_dependent_potassium_current * i_NaCa in component Na_Ca_exchanger * i_K1 in component time_independent_potassium_current * i_Kp in component plateau_potassium_current * i_p_Ca in component sarcolemmal_calcium_pump * i_Na_b in component sodium_background_current * i_Ca_b in component calcium_background_current * i_NaK in component sodium_potassium_pump * i_ns_Ca in component non_specific_calcium_activated_current * i_to in component transient_outward_potassium_current * g_to in component transient_outward_potassium_current * R_to in component transient_outward_potassium_current * E_K in component time_dependent_potassium_current * z in component transient_outward_potassium_current_z_gate * alpha_z in component transient_outward_potassium_current_z_gate * beta_z in component transient_outward_potassium_current_z_gate * alpha_y in component transient_outward_potassium_current_y_gate * beta_y in component transient_outward_potassium_current_y_gate * E_Na in component fast_sodium_current * g_Na in component fast_sodium_current * Nao in component ionic_concentrations * alpha_m in component fast_sodium_current_m_gate * beta_m in component fast_sodium_current_m_gate * alpha_h in component fast_sodium_current_h_gate * beta_h in component fast_sodium_current_h_gate * alpha_j in component fast_sodium_current_j_gate * beta_j in component fast_sodium_current_j_gate * i_CaCa in component L_type_Ca_channel * i_CaK in component L_type_Ca_channel * i_CaNa in component L_type_Ca_channel * gamma_Nai in component L_type_Ca_channel * gamma_Nao in component L_type_Ca_channel * gamma_Ki in component L_type_Ca_channel * gamma_Ko in component L_type_Ca_channel * I_CaCa in component L_type_Ca_channel * I_CaK in component L_type_Ca_channel * I_CaNa in component L_type_Ca_channel * P_Ca in component L_type_Ca_channel * P_Na in component L_type_Ca_channel * P_K in component L_type_Ca_channel * gamma_Cai in component L_type_Ca_channel * gamma_Cao in component L_type_Ca_channel * Cao in component ionic_concentrations * f_Ca in component L_type_Ca_channel_f_Ca_gate * alpha_d in component L_type_Ca_channel_d_gate * beta_d in component L_type_Ca_channel_d_gate * d_infinity in component L_type_Ca_channel_d_gate * tau_d in component L_type_Ca_channel_d_gate * alpha_f in component L_type_Ca_channel_f_gate * beta_f in component L_type_Ca_channel_f_gate * f_infinity in component L_type_Ca_channel_f_gate * tau_f in component L_type_Ca_channel_f_gate * Km_Ca in component L_type_Ca_channel_f_Ca_gate * g_K in component time_dependent_potassium_current * PR_NaK in component time_dependent_potassium_current * Xi in component time_dependent_potassium_current_Xi_gate * alpha_X in component time_dependent_potassium_current_X_gate * beta_X in component time_dependent_potassium_current_X_gate * E_K1 in component time_independent_potassium_current * g_K1 in component time_independent_potassium_current * K1_infinity in component time_independent_potassium_current_K1_gate * alpha_K1 in component time_independent_potassium_current_K1_gate * beta_K1 in component time_independent_potassium_current_K1_gate * E_Kp in component plateau_potassium_current * g_Kp in component plateau_potassium_current * Kp in component plateau_potassium_current * K_mpCa in component sarcolemmal_calcium_pump * I_pCa in component sarcolemmal_calcium_pump * g_Nab in component sodium_background_current * E_NaN in component sodium_background_current * g_Cab in component calcium_background_current * E_CaN in component calcium_background_current * I_NaK in component sodium_potassium_pump * f_NaK in component sodium_potassium_pump * K_mNai in component sodium_potassium_pump * K_mKo in component sodium_potassium_pump * sigma in component sodium_potassium_pump * i_ns_Na in component non_specific_calcium_activated_current * i_ns_K in component non_specific_calcium_activated_current * P_ns_Ca in component non_specific_calcium_activated_current * I_ns_Na in component non_specific_calcium_activated_current * I_ns_K in component non_specific_calcium_activated_current * K_m_ns_Ca in component non_specific_calcium_activated_current * K_NaCa in component Na_Ca_exchanger * K_mNa in component Na_Ca_exchanger * K_mCa in component Na_Ca_exchanger * K_sat in component Na_Ca_exchanger * eta in component Na_Ca_exchanger * K_mTn in component calcium_buffers_in_the_myoplasm * K_mCMDN in component calcium_buffers_in_the_myoplasm * Tn_max in component calcium_buffers_in_the_myoplasm * CMDN_max in component calcium_buffers_in_the_myoplasm * Tn_buff in component calcium_buffers_in_the_myoplasm * CMDN_buff in component calcium_buffers_in_the_myoplasm * i_rel in component calcium_fluxes_in_the_SR * i_up in component calcium_fluxes_in_the_SR * i_leak in component calcium_fluxes_in_the_SR * i_tr in component calcium_fluxes_in_the_SR * G_rel in component calcium_fluxes_in_the_SR * G_rel_max in component calcium_fluxes_in_the_SR * tau_on in component calcium_fluxes_in_the_SR * tau_off in component calcium_fluxes_in_the_SR * tau_tr in component calcium_fluxes_in_the_SR * t in component calcium_fluxes_in_the_SR * K_mrel in component calcium_fluxes_in_the_SR * delta_Ca_i2 in component calcium_fluxes_in_the_SR * delta_Ca_ith in component calcium_fluxes_in_the_SR * CSQN_buff in component calcium_fluxes_in_the_SR * CSQN_max in component calcium_fluxes_in_the_SR * CSQN_th in component calcium_fluxes_in_the_SR * K_mCSQN in component calcium_fluxes_in_the_SR * K_mup in component calcium_fluxes_in_the_SR * K_leak in component calcium_fluxes_in_the_SR * I_up in component calcium_fluxes_in_the_SR * Ca_NSR_max in component calcium_fluxes_in_the_SR * calcium_overload in component calcium_fluxes_in_the_SR * A_cap in component ionic_concentrations * R_A_V in component ionic_concentrations * V_myo in component ionic_concentrations * V_cleft in component ionic_concentrations * V_JSR in component ionic_concentrations * V_NSR in component ionic_concentrations * d/dt V in component membrane * d/dt z in component transient_outward_potassium_current_z_gate * d/dt y in component transient_outward_potassium_current_y_gate * d/dt m in component fast_sodium_current_m_gate * d/dt h in component fast_sodium_current_h_gate * d/dt j in component fast_sodium_current_j_gate * d/dt d in component L_type_Ca_channel_d_gate * d/dt f in component L_type_Ca_channel_f_gate * d/dt X in component time_dependent_potassium_current_X_gate * d/dt Nai in component ionic_concentrations * d/dt Cai in component ionic_concentrations * d/dt Ki in component ionic_concentrations * d/dt Ko in component ionic_concentrations * d/dt Ca_JSR in component ionic_concentrations * d/dt Ca_NSR in component ionic_concentrations * d/dt Ca_foot in component ionic_concentrations