Which of the following statements about the action potential is false?
A)The rapid depolarization phase is caused by the entry of potassium ions.
B)During the repolarization phase,sodium channels close and potassium channels open.
C)During the depolarization phase,membrane potential becomes positive.
D)In the after-hyperpolarization phase,membrane potential approaches the potassium equilibrium potential.
E)Repolarization occurs as potassium ions leave the axon.

Question

Quizplus · Accepted Answer

The rapid depolarization phase is actually caused by the entry of sodium ions, not potassium ions. The influx of sodium ions produces a positive charge inside the cell, causing the membrane potential to become more positive.

Which of the Following Statements About the Action Potential Is