During the Relative Refractory Period,an Initial Threshold-Level Depolarization Is Usually

question 207

Multiple Choice

During the relative refractory period,an initial threshold-level depolarization is usually not sufficient to trigger an action potential.Why?

• A) Only some Na⁺ channels have returned to their resting position.
• B) Only K⁺ channels are still open, so Na⁺ entry is offset by K⁺ loss.
• C) Only a few K⁺ channels have returned to their resting position.
• D) The statement is incorrect; a threshold-level depolarization always triggers an action potential.
• E) Some Na⁺ channels have returned to their resting position and K⁺ channels are still open, so Na⁺ entry is offset by K⁺ loss.

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