Model is underconstrained. The following variables couldn't be defined: * i_Na in component fast_sodium_current * i_Ca_L in component L_type_Ca_channel * i_Ca_T in component T_type_Ca_channel * i_Kr in component rapid_time_dependent_potassium_current * i_Ks in component slow_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_K_ATP in component ATP_dependent_potassium_current * i_to in component transient_outward_potassium_current * R_to in component transient_outward_potassium_current * E_K in component ATP_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 * P_O_Na in component Na_channel_states * alpha_11 in component Na_channel_states * beta_11 in component Na_channel_states * alpha_12 in component Na_channel_states * beta_12 in component Na_channel_states * alpha_13 in component Na_channel_states * beta_13 in component Na_channel_states * alpha_2 in component Na_channel_states * beta_2 in component Na_channel_states * alpha_3 in component Na_channel_states * beta_3 in component Na_channel_states * alpha_4 in component Na_channel_states * beta_4 in component Na_channel_states * alpha_5 in component Na_channel_states * beta_5 in component Na_channel_states * i_CaCa in component L_type_Ca_channel * i_CaK in component L_type_Ca_channel * i_CaNa 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 * 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 * E_Ca in component T_type_Ca_channel * b_infinity in component T_type_Ca_channel_b_gate * tau_b in component T_type_Ca_channel_b_gate * g_infinity in component T_type_Ca_channel_g_gate * tau_g in component T_type_Ca_channel_g_gate * g_Kr in component rapid_time_dependent_potassium_current * E_Kr in component rapid_time_dependent_potassium_current * Rr in component rapid_time_dependent_potassium_current_Rr_gate * Xr_infinity in component rapid_time_dependent_potassium_current_Xr_gate * tau_Xr in component rapid_time_dependent_potassium_current_Xr_gate * g_Ks in component slow_time_dependent_potassium_current * E_Ks in component slow_time_dependent_potassium_current * tau_Xs1 in component slow_time_dependent_potassium_current_Xs1_gate * Xs_infinity in component slow_time_dependent_potassium_current_Xs1_gate * tau_Xs2 in component slow_time_dependent_potassium_current_Xs2_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 * Kp in component plateau_potassium_current * E_NaN in component sodium_background_current * E_CaN in component calcium_background_current * f_NaK 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 * I_ns_Na in component non_specific_calcium_activated_current * I_ns_K in component non_specific_calcium_activated_current * g_K_ATP in component ATP_dependent_potassium_current * 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 * delta_Ca_i 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 * 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 P_LC3 in component Na_channel_states * d/dt P_LC2 in component Na_channel_states * d/dt P_LC1 in component Na_channel_states * d/dt P_LO in component Na_channel_states * d/dt P_UIF in component Na_channel_states * d/dt P_UIC3 in component Na_channel_states * d/dt P_UIC2 in component Na_channel_states * d/dt P_UIM1 in component Na_channel_states * d/dt P_UIM2 in component Na_channel_states * d/dt P_UC3 in component Na_channel_states * d/dt P_UC2 in component Na_channel_states * d/dt P_UC1 in component Na_channel_states * d/dt P_UO in component Na_channel_states * d/dt d in component L_type_Ca_channel_d_gate * d/dt f in component L_type_Ca_channel_f_gate * d/dt b in component T_type_Ca_channel_b_gate * d/dt g in component T_type_Ca_channel_g_gate * d/dt Xr in component rapid_time_dependent_potassium_current_Xr_gate * d/dt Xs1 in component slow_time_dependent_potassium_current_Xs1_gate * d/dt Xs2 in component slow_time_dependent_potassium_current_Xs2_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