Model is underconstrained. The following variables couldn't be defined: * i_tot in component membrane * i_CaL in component L_type_calcium_current * i_CaT in component T_type_calcium_current * i_Na in component fast_sodium_current * i_K in component delayed_rectifying_potassium_current * i_f in component hyperpolarising_activated_current * i_p in component sodium_potassium_pump * i_NaCa in component sodium_calcium_exchange_current * i_bNa in component background_sodium_current * i_KACh in component ACh_activated_potassium_current * E_Ca in component reversal_potentials * E_Na in component reversal_potentials * E_K in component reversal_potentials * ACh in component ACh_kinetics_in_neuroeffector_junction * d_infinity in component L_type_calcium_current_d_gate * f_infinity in component L_type_calcium_current_f_gate * tau_f in component L_type_calcium_current_f_gate * alpha_w in component L_type_calcium_current_w_gate * beta_w in component L_type_calcium_current_w_gate * d_infinity in component T_type_calcium_current_d_gate * tau_d in component T_type_calcium_current_d_gate * f_infinity in component T_type_calcium_current_f_gate * tau_f in component T_type_calcium_current_f_gate * 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 * i_KK in component delayed_rectifying_potassium_current * i_KNa in component delayed_rectifying_potassium_current * x_infinity in component delayed_rectifying_potassium_current_x_gate * tau_x in component delayed_rectifying_potassium_current_x_gate * i_fNa in component hyperpolarising_activated_current * i_fK in component hyperpolarising_activated_current * alpha_y in component hyperpolarising_activated_current_y_gate * beta_y in component hyperpolarising_activated_current_y_gate * alpha_v in component hyperpolarising_activated_current_y_gate * beta_v in component hyperpolarising_activated_current_y_gate * x1 in component sodium_calcium_exchange_current * x2 in component sodium_calcium_exchange_current * x3 in component sodium_calcium_exchange_current * x4 in component sodium_calcium_exchange_current * k41 in component sodium_calcium_exchange_current * k34 in component sodium_calcium_exchange_current * k23 in component sodium_calcium_exchange_current * k21 in component sodium_calcium_exchange_current * k32 in component sodium_calcium_exchange_current * k43 in component sodium_calcium_exchange_current * k12 in component sodium_calcium_exchange_current * k14 in component sodium_calcium_exchange_current * do in component sodium_calcium_exchange_current * di in component sodium_calcium_exchange_current * alpha_u in component ACh_activated_potassium_current_u_gate * beta_u in component ACh_activated_potassium_current_u_gate * i_up in component sarcoplasmic_reticulum_kinetics * i_tr in component sarcoplasmic_reticulum_kinetics * i_rel in component sarcoplasmic_reticulum_kinetics * d/dt E in component membrane * d/dt d in component L_type_calcium_current_d_gate * d/dt f in component L_type_calcium_current_f_gate * d/dt f2 in component L_type_calcium_current_f2_gate * d/dt w in component L_type_calcium_current_w_gate * d/dt d in component T_type_calcium_current_d_gate * d/dt f in component T_type_calcium_current_f_gate * d/dt m in component fast_sodium_current_m_gate * d/dt h in component fast_sodium_current_h_gate * d/dt x in component delayed_rectifying_potassium_current_x_gate * d/dt v in component hyperpolarising_activated_current_y_gate * d/dt y in component hyperpolarising_activated_current_y_gate * d/dt u in component ACh_activated_potassium_current_u_gate * d/dt ACh_ms in component ACh_kinetics_in_neuroeffector_junction * d/dt ACh in component ACh_kinetics_in_neuroeffector_junction * d/dt ACh_ex in component ACh_kinetics_in_neuroeffector_junction * d/dt Nai in component ion_concentrations * d/dt Nao in component ion_concentrations * d/dt Ki in component ion_concentrations * d/dt Ko in component ion_concentrations * d/dt Cai in component ion_concentrations * d/dt Cao in component ion_concentrations * d/dt Caup in component ion_concentrations * d/dt Carel in component ion_concentrations