Indicate the mechanism responsible for the rapid depolarization that occurs as the "upsweep" of membrane potential peaks during the action potential. A)closing of the voltage-gated Na⁺ channel activation gates B)closing of the voltage-gated Na⁺ channel inactivation gates C)opening of the voltage-gated K⁺ channel gates D)both opening of the K⁺ channel gates and closing of the Na⁺ channel inactivation gates E)both opening of the K⁺ channel gates and closing of the Na⁺ channel activation gates

Question

Quizplus · Accepted Answer

The rapid depolarization during the action potential is due to the opening of voltage-gated potassium (K⁺) channels and the closing of voltage-gated sodium (Na⁺) channel inactivation gates. This allows for an efflux of potassium ions and prevents further influx of sodium ions, leading to repolarization of the cell membrane.

Indicate the Mechanism Responsible for the Rapid Depolarization That Occurs