The Rapid Depolarization of a Neuron During the First Half

question 56

Multiple Choice

The rapid depolarization of a neuron during the first half of an action potential is due to the

• A) exit of K⁺ ions from the cell through gated potassium channels.
• B) rapid reversal of ion concentration caused by the action of the sodium-potassium pump.
• C) entry of Na⁺ ions into the cell through gated sodium channels.
• D) movement of both Na⁺ and K⁺ ions through appropriate open channels.
• E) closing of sodium channels.

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Definitions:

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