The absolute refractory period of an action potential is due to _______________?
Correct answer: A. Voltage inactivation of the Na+ channel
- A. Voltage inactivation of the Na+ channel
- B. Depletion of intracellular Na+
- C. Inactivation of Na+ k+ ATPase
- D. Insufficient neurotransmitter
Explanation
During the absolute refractory period, voltage-gated Na+ channels are inactivated and cannot reopen immediately, regardless of stimulus strength. Na+/K+-ATPase activity is not the cause of this period.
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