After the depolarisation phase of an action potential, the resting potential is restored by ________.
A) the opening of voltage-gated potassium channels and the inactivation of sodium channels
B) a decrease in the membrane's permeability to potassium and chloride ions
C) a brief inhibition of the sodium-potassium pump
D) the opening of more voltage-gated sodium channels

Question

Quizplus · Accepted Answer

After depolarization and the influx of sodium ions, the membrane potential becomes more positive. The restoration of the resting potential is mainly due to the opening of voltage-gated potassium channels, which allows potassium ions to leave the cell and return the membrane potential to its negative resting state. Additionally, the inactivation of sodium channels also contributes to the restoration of the resting potential.

After the Depolarisation Phase of an Action Potential, the Resting