Action potential (3)

Action potential 3

When the transmembrane potential reaches the highest level of +30mV (complete depolarisation), the sodium channels will close. At the same time, the potassium channels will open (due to the membrane potential of +30mV) and potassium ions will leave the cell down their electrical and chemical gradient. With the opening of the potassium channel the repolarisation is initiated.

1

Action potentials are restricted to areas of excitable membranes that contain voltage-dependent channels.