i_sp i_Na i_K i_l i_Ca i_SK i_ex Cm G V E_rev L 1 tau1 D 1 tau2 alpha_m 1 m beta_m m 0.109 V 38 1 V 38 5 0.0744 V 38 V 38 5 1 alpha_h 1 h beta_h h 0.0192 55 V 15 2.48 1 17 V 21 g_Na m 3 h V E_Na alpha_n 1 n beta_n n 0.012 V 45 1 45 V 5 0.204 V 50 40 g_K n 4 V E_K g_l V E_l alpha_m 1 m beta_m m 5 1 -0.075 V 5 0.05 2 V 1 V 2 8 Ff time_ tau_f Fm time_ tau_m Fs time_ tau_s Fr PCa m 2 h ghk V 2 F 2 R T Cao Ca0 2 V F R T 1 2 V F R T m m_infinity tau_m Car 1 Car 1 beta_k 1 Car Ca0 Cac n_SK g_SK m 2 V E_K DCa Ai2 delta_r vol_i DCa Ai2 delta_r vol_i Vmax Ca0 Kex Ca0 Vmax Ca_rest Kex Ca_rest 9 -6 5.5 -6 2.3 -5 k2 B a1 Ca0 b1 Ca0 a2 a3 Ca0 3 B k2 1 F0 FCaDy F0 Ddy Ai2 delta_r vol_i Ddy Ai2 delta_r vol_i kbc Ca1 k2b CaBu k2d CaDy i_Ca i_ex A0 2 F vol0 kfc Ca0 k1b Bu Ca0 k1d Dy Ca0 diameter 2 Nc 1