Net Movement of This Ion is Primarily Associated with Repolarization

Question

Net movement of this ion is primarily associated with repolarization.
A) Na+
B) Mg2+
C) Ca2+
D) K+

Accepted Answer

The net movement of potassium ions (K+) out of the cell is primarily responsible for repolarization during the action potential in neurons and muscle cells. This outflow of K+ helps to restore the negative charge inside the cell, returning the cell to its resting state after depolarization.