During the Transmission of an Action Potential, _______

Question

During the transmission of an action potential, _______.
A) sodium-potassium pumps prevent sodium from entering the cell
B) voltage-activated sodium channels open, allowing sodium ions to pass into the cell
C) chloride ion channels begin to close
D) repolarization takes place ahead of the action potential

Accepted Answer

During the transmission of an action potential, voltage-activated sodium channels open, allowing sodium ions to pass into the cell. This influx of positively charged ions depolarizes the membrane, leading to the propagation of the action potential. Sodium-potassium pumps are involved in resetting the membrane potential after the action potential has passed, but they do not prevent sodium from entering the cell during transmission. Chloride ion channels are not directly involved in the transmission of the action potential. Repolarization occurs after the peak of the action potential, not ahead of it.