In the sequence of permeability changes for a complete action potential, the first of these events that occurs is
A) the activation of the sodium-potassium "pump."
B) the inhibition of the sodium-potassium "pump."
C) the opening of voltage-gated sodium channels.
D) the closing of voltage-gated potassium channels.
E) the opening of voltage-gated potassium channels.

Question

Quizplus · Accepted Answer

The first event in the sequence of permeability changes for a complete action potential is the opening of voltage-gated sodium channels, allowing an influx of sodium ions into the cell. This depolarizes the membrane potential and triggers the propagation of the action potential.

In the Sequence of Permeability Changes for a Complete Action