Near the peak of the action potential, which type of ion begins to leave the cell?
A) sodium
B) potassium
C) calcium
D) magnesium

Question

Quizplus · Accepted Answer

Near the peak of the action potential, the voltage-gated potassium channels open and potassium ions begin to leave the cell, leading to repolarization. Sodium ions rush into the cell at the beginning of the action potential, while calcium ions play a role in certain types of cells but are not primarily responsible for the repolarization phase. Magnesium ions are not directly involved in the action potential.

Near the Peak of the Action Potential, Which Type of Ion