Nerves and muscles: AP Biology Free Practice Problems & Quiz Questions

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What happens during repolarization of an action potential?

the Na⁺/K⁺ pump has restored the ion gradients and no channel is open: the cell is at restthe K⁺ channels close slowly, so the membrane becomes more negative than the resting potentialvoltage-gated K⁺ channels are open and K⁺ leaves the axon while the Na⁺ channels closevoltage-gated Na⁺ channels open and Na⁺ rushes into the axon

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