How is a neuron's resting potential restored after an action potential has passed a segment of the axon?
A) Sodium ions are pumped into the cell.
B) Chloride ions are pumped into the cell.
C) Sodium ions are pumped out of the cell.
D) Potassium ions are pumped out of the cell.

Question

Quizplus · Accepted Answer

After an action potential has passed a segment of the axon, the resting potential is restored by the Na+/K+ pump. This pump actively transports three sodium ions (Na+) out of the cell and two potassium ions (K+) into the cell, which helps to maintain the ion concentration gradients necessary for the generation of subsequent action potentials. Therefore, choice D, "Potassium ions are pumped out of the cell," is the correct answer.

How Is a Neuron's Resting Potential Restored After an Action