i_NaP i_KS i_Na i_K i_L i_tonic_e i_app C 1 1 V theta_m sigma_m n_infinity n tau_n 1 1 V theta_n sigma_n tau_n_max V theta_n 2 sigma_n g_Na m_infinity 3 1 n V E_Na n_infinity n tau_n 1 1 V theta_n sigma_n tau_n_max V theta_n 2 sigma_n g_K n 4 V E_K k_infinity k tau_k 1 1 V theta_k sigma_k tau_k_max V theta_k 2 sigma_k g_KS k V E_K 1 1 V theta_m sigma_m g_NaP m_infinity V E_Na g_L V E_L g_tonic_e V E_syn_e