Membrane Potential

Hodgkin-Huxley model — Na⁺/K⁺ gating, action potential, refractory period
m
h
n
Hodgkin-Huxley (1952)
C·dV/dt = I - gNa·m³h·(V-ENa) - gK·n⁴·(V-EK) - gL·(V-EL)

m = Na activation (fast)
h = Na inactivation
n = K activation (slow)

Nobel Prize 1963.