After the depolarization 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

During depolarization, sodium channels open, allowing sodium ions to rush into the cell, and the membrane potential becomes more positive. To restore the resting potential, voltage-gated potassium channels open, allowing potassium ions to move out of the cell, while voltage-gated sodium channels become inactivated. This movement of ions helps to re-establish the negative resting potential. Therefore, the opening of voltage-gated potassium channels and the inactivation of sodium channels is required for the restoration of the resting potential. Choices B, C, and D are incorrect because they do not describe the process involved in repolarization.

After the Depolarization Phase of an Action Potential, the Resting