After an action potential is triggered,the rapid increase in membrane potential can be attributed to
A)the direction reversal of the sodium/potassium pump.
B)the closing of sodium leak channels.
C)the opening of the activation gates of voltage-gated sodium channels.
D)the closing of potassium leak channels.
E)the opening of the voltage-gated potassium channels.

Question

Quizplus · Accepted Answer

The rapid increase in membrane potential following an action potential is due to the opening of the activation gates of voltage-gated sodium channels, which allows an influx of sodium ions into the cell. This generates a positive feedback loop, causing even more activation gates to open and more sodium ions to enter, leading to depolarization of the membrane potential.

After an Action Potential Is Triggered,the Rapid Increase in Membrane