medium · MCAT bio-biochem
During the repolarization phase of a neuronal action potential, which of the following events is primarily responsible for restoring the negative membrane potential?
- Opening of voltage-gated sodium channels.
- Opening of chloride channels to allow Cl^- influx.
- Opening of voltage-gated potassium channels and inactivation of sodium channels.
- Active transport of three Na^+ ions out and two K^+ ions in by the Na^+/K^+ ATPase.
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