medium · MCAT bio-biochem
During the repolarization phase of an action potential in a neuron, which of the following events is primarily responsible for returning the membrane potential toward its resting value?
- Closing of voltage-gated potassium channels.
- Activation of the Na^+/K^+ pump to restore ion gradients.
- Opening of voltage-gated potassium channels and inactivation of sodium channels.
- Opening of voltage-gated sodium channels.
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