The absolute refractory period of an action potential is due to _______________?
Correct answer: D. Voltage inactivation of the Na+ channel
- A. Insufficient neurotransmitter
- B. Depletion of intracellular Na+
- C. Inactivation of Na+ k+ ATPase
- D. Voltage inactivation of the Na+ channel
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.
Last updated
Practise Neurophysiology
64 free Neurophysiology MCQs from Physiology, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physiology questions like this
Physiology is on 3 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
Abdominal visceral pain is transmitted by ________________?
Afferent component of corneal reflex is mediated by ________________?
Aphasia is most likely associated with a lesion in_______________?
Axon hillock is part of the soma of neuron which________________?
Blood brain barriers is absent in all of the following areas except__________________?