Which of the Following Is Responsible for the Repolarization of the Membrane

Multiple Choice

Which of the following is responsible for the repolarization of the membrane after the peak of the action potential?

A) The membrane potential reaches the Na⁺ equilibrium potential.
B) The voltage-gated Na⁺ channels begin to inactivate.
C) The slowly opening voltage-gated K⁺ channels allow K⁺ to enter.
D) The influx of Na⁺ and the outflow of K⁺ are equal.
E) There is no longer a gradient to drive K⁺ out of the cell.