Which of the Following Correctly Relates the Status of the Sodium

question 20

Multiple Choice

Which of the following correctly relates the status of the sodium channel during an action potential cycle? (m-gate = activation gate, h-gate = inactivation gate)

• A)while resting, both the m-gate and h-gate are closed
• B)during depolarization, both the m-gate and h-gate open allowing Na⁺ to exit the cell
• C)during repolarization, only the m-gate is closed
• D)during the refractory period, both the m-gate and h-gate are closed
• E)none of the above

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