The Repolarizing Phase of the Action Potential

Question

The repolarizing phase of the action potential
A) means that the inside of the cell is becoming more positive.
B) is caused by the movement of sodium (Na+) into the cell.
C) is caused by the movement of potassium (K+) out of the cell.
D) is caused by the Na+/ K+ pump located in the membrane.

Accepted Answer

During the repolarizing phase of the action potential, the cell returns to its resting potential by allowing the movement of potassium ions out of the cell, which makes the inside of the cell more negative. It is not caused by the movement of sodium ions into the cell, nor by the Na+/K+ pump located in the membrane.