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_Ca_L in component L_type_calcium_current * i_K in component delayed_rectifier_current * i_K_Ca in component calcium_activated_potassium_current * i_Ki in component inward_rectifier_current * i_M in component stretch_sensitive_current * i_NaCa in component sodium_calcium_exchanger * i_NaK in component sodium_potassium_pump * i_CaP in component calcium_pump * i_B in component background_currents * E_Ca_L in component L_type_calcium_current * g_Ca_L in component L_type_calcium_current * Ca_o in component extracellular_ionic_concentrations * f in component L_type_calcium_current_f_gate * d_infinity in component L_type_calcium_current_d_gate * tau_d in component L_type_calcium_current_d_gate * f_infinity in component L_type_calcium_current_f_gate * tau_ff in component L_type_calcium_current_f_gate * E_K in component calcium_activated_potassium_current * g_K_Ca in component calcium_activated_potassium_current * K_o in component extracellular_ionic_concentrations * P_K_Ca in component calcium_activated_potassium_current_P_K_Ca_gate * Ps_infinity in component calcium_activated_potassium_current_P_K_Ca_gate * Pf_infinity in component calcium_activated_potassium_current_P_K_Ca_gate * Po_infinity in component calcium_activated_potassium_current_P_K_Ca_gate * tau_Ps in component calcium_activated_potassium_current_P_K_Ca_gate * tau_Pf in component calcium_activated_potassium_current_P_K_Ca_gate * V_1_2_K_Ca in component calcium_activated_potassium_current_P_K_Ca_gate * g_K in component delayed_rectifier_current * Pk in component delayed_rectifier_current_Pk_gate * Pk_infinity in component delayed_rectifier_current_Pk_gate * tau_P1 in component delayed_rectifier_current_Pk_gate * tau_P2 in component delayed_rectifier_current_Pk_gate * V_1_2 in component delayed_rectifier_current_Pk_gate * k in component delayed_rectifier_current_Pk_gate * i_M_K in component stretch_sensitive_current * i_M_Na in component stretch_sensitive_current * i_M_Ca in component stretch_sensitive_current * Am in component stretch_sensitive_current * Pm in component stretch_sensitive_current * P_Na in component stretch_sensitive_current * P_Ca in component stretch_sensitive_current * P_K in component stretch_sensitive_current * sigma_1_2 in component stretch_sensitive_current * sigma in component stretch_sensitive_current * k_sigma in component stretch_sensitive_current * Na_o in component extracellular_ionic_concentrations * g_max_Ki in component inward_rectifier_current * G_Ki in component inward_rectifier_current * V_1_2_Ki in component inward_rectifier_current * n_Ki in component inward_rectifier_current * A in component inward_rectifier_current * B in component inward_rectifier_current * I_Ca_P in component calcium_pump * K_CaCM in component smooth_muscle_contraction * CaCM in component intracellular_ionic_concentrations * I_NaK in component sodium_potassium_pump * Km_Nai in component sodium_potassium_pump * Km_Ko in component sodium_potassium_pump * g_NaCa in component sodium_calcium_exchanger * d_NaCa in component sodium_calcium_exchanger * phi_R in component sodium_calcium_exchanger * phi_F in component sodium_calcium_exchanger * gamma in component sodium_calcium_exchanger * i_B_Na in component background_currents * i_B_Ca in component background_currents * i_B_K in component background_currents * g_Nab in component background_currents * g_Cab in component background_currents * g_Kb in component background_currents * E_Na in component background_currents * E_Ca in component background_currents * S_CM_Ca in component intracellular_ionic_concentrations * CaS_CM in component intracellular_ionic_concentrations * B_F_Ca in component intracellular_ionic_concentrations * CaB_F in component intracellular_ionic_concentrations * k1 in component intracellular_ionic_concentrations * k_1 in component intracellular_ionic_concentrations * kd in component intracellular_ionic_concentrations * k_d in component intracellular_ionic_concentrations * Vol_Ca in component intracellular_ionic_concentrations * Vol_i in component intracellular_ionic_concentrations * delta_S_CM_cal in component intracellular_ionic_concentrations * delta_B_F_cal in component intracellular_ionic_concentrations * i_up in component calcium_fluxes_in_the_SR * i_rel in component calcium_fluxes_in_the_SR * i_tr in component calcium_fluxes_in_the_SR * I_up in component calcium_fluxes_in_the_SR * tau_rel in component calcium_fluxes_in_the_SR * tau_tr in component calcium_fluxes_in_the_SR * Ca_u in component calcium_fluxes_in_the_SR * Ca_r in component calcium_fluxes_in_the_SR * Vol_u in component calcium_fluxes_in_the_SR * Vol_r in component calcium_fluxes_in_the_SR * Km_up in component calcium_fluxes_in_the_SR * R10 in component CICR_mechanism_of_the_SR * R00 in component CICR_mechanism_of_the_SR * R01 in component CICR_mechanism_of_the_SR * R11 in component CICR_mechanism_of_the_SR * Kr1 in component CICR_mechanism_of_the_SR * Kr2 in component CICR_mechanism_of_the_SR * Kr1_ in component CICR_mechanism_of_the_SR * Kr2_ in component CICR_mechanism_of_the_SR * AM in component smooth_muscle_contraction * AMp in component smooth_muscle_contraction * Mp in component smooth_muscle_contraction * M in component smooth_muscle_contraction * K1 in component smooth_muscle_contraction * K2 in component smooth_muscle_contraction * K3 in component smooth_muscle_contraction * K4 in component smooth_muscle_contraction * K5 in component smooth_muscle_contraction * K6 in component smooth_muscle_contraction * K7 in component smooth_muscle_contraction * Fp in component passive_force * kp in component passive_force * alpha_p in component passive_force * l0 in component passive_force * lc in component passive_force * beta in component cross_bridge_elasticity * la in component cross_bridge_elasticity * lopt in component cross_bridge_elasticity * Fx in component cross_bridge_elasticity * kx1 in component cross_bridge_elasticity * kx2 in component cross_bridge_elasticity * lx in component cross_bridge_elasticity * Fa in component active_force_generation * vx in component active_force_generation * ia in component active_force_generation * fAMp in component active_force_generation * fAM in component active_force_generation * Fs in component series_viscoelastic_force * ks in component series_viscoelastic_force * alpha_s in component series_viscoelastic_force * delta_ls in component series_viscoelastic_force * ls0 in component series_viscoelastic_force * mu_s in component series_viscoelastic_force * d/dt V in component membrane * d/dt d in component L_type_calcium_current_d_gate * d/dt ff in component L_type_calcium_current_f_gate * d/dt Pf in component calcium_activated_potassium_current_P_K_Ca_gate * d/dt Ps in component calcium_activated_potassium_current_P_K_Ca_gate * d/dt P2 in component delayed_rectifier_current_Pk_gate * d/dt P1 in component delayed_rectifier_current_Pk_gate * d/dt Na_i in component intracellular_ionic_concentrations * d/dt K_i in component intracellular_ionic_concentrations * d/dt Ca_i in component intracellular_ionic_concentrations * d/dt S_CM_cal in component intracellular_ionic_concentrations * d/dt B_F_cal in component intracellular_ionic_concentrations * d/dt Ca_up in component calcium_fluxes_in_the_SR * d/dt Ca_r in component calcium_fluxes_in_the_SR * d/dt ls in component series_viscoelastic_force