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The absolute refractory period of an action potential is due to _______________?

/ Medical Mcqs, Muscles and Neuromusclar Junction, Physiology Mcqs / By
The absolute refractory period of an action potential is due to _______________?

A. Insufficient neurotransmitter
B. Depletion of intracellular Na+
C. Inactivation of Na+ k+ ATPase
D. Voltage inactivation of the Na+ channel