Action potential repolarization
During the repolarization phase of a neuron's action potential, the main event is:
Answer A: explanation for every choice
A
Correct. Voltage-gated K⁺ channels open, and K⁺ leaving the cell returns the membrane toward rest.
B
Na⁺ influx causes depolarization, the rising phase.
C
The pump maintains gradients over time but is too slow to cause repolarization.
D
Cl⁻ influx contributes to inhibitory postsynaptic potentials, not action potential repolarization.
TakeawayDepolarization: Na⁺ in. Repolarization: K⁺ out.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID bb85.