What happens during the hyperpolarization (undershoot) phase of an action potential?
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Correct answer: Potassium channels stay open, letting K⁺ continue to leave
Voltage-gated K⁺ channels are relatively slow to close. This leads to an excessive loss of positive ions, making the membrane potential even more negative than the resting state for a short period — the undershoot (hyperpolarization) phase.
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