Hodgkin-Huxley Action Potential
Voltage-gated ion channels · Na⁺ and K⁺ conductance dynamics
STIMULUS
Current I_ext (μA/cm²)
10
Duration (ms)
2
Interval (ms)
20
⚡ Fire Stimulus
🔁 Pulse Train
↺ Reset
PARAMETERS
g_Na (mS/cm²)
120
g_K (mS/cm²)
36
C_m (μF/cm²)
1
LEGEND
Voltage V (mV)
m: Na⁺ activation
h: Na⁺ inactivation
n: K⁺ activation
I_Na current
I_K current
HH Model (1952):
C_m dV/dt = I_ext − g_Na·m³h(V−E_Na) − g_K·n⁴(V−E_K) − g_L(V−E_L)
Na⁺ channels activate fast (
m
) and inactivate slower (
h
). K⁺ channels activate with delay (
n
). The interplay generates the action potential spike.