STIMULATION BASED LEARNING | ACTION POTENTIAL GRAPH and IONS MOVEMENT

RESTResting membrane potential

−70 mV

Speed 1.2×

LIVE CHANNEL STATUS

Na⁺

CLOSED

—

Voltage-gated Na⁺ channels are closed and ready.

K⁺

LEAK

→ OUT

K⁺ leak conductance contributes to resting potential.

Ca²⁺

CLOSED

—

Ca²⁺ is not the main current in the neuronal AP.

WHAT THE GRAPH MEANS

K⁺ leak maintains the resting potential.

The moving cursor is synchronized with the channel states below. Watch the dominant ion change as the curve changes.

Nerve: rapid depolarization is Na⁺ influx; repolarization is K⁺ efflux.

MEMBRANE — WATCH THE IONS MOVE

EXTRACELLULAR

INTRACELLULAR

Na⁺

K⁺

Ca²⁺

Na⁺Na⁺ K⁺K⁺ Ca²⁺