The refractory period of a neuron
A) is the period when the sodium-potassium pump is nonfunctional.
B) results from activation of voltage-gated chloride channels.
C) results from closing of inactivated voltage-gated sodium channels.
D) occurs when the action potential reaches the synapse.
E) lasts about a minute.

Question

Quizplus · Accepted Answer

The refractory period of a neuron occurs when the inactivated voltage-gated sodium channels are closed, preventing the neuron from firing another action potential. Choice A is incorrect because the sodium-potassium pump continues to function during the refractory period, restoring the resting potential of the neuron. Choice B is incorrect because voltage-gated chlorides channels play no role in the refractory period of a neuron. Choice D is incorrect because the synapse is not directly involved in the refractory period of a neuron, although it may be affected by it. Choice E is incorrect because the refractory period typically lasts only a few milliseconds.

The Refractory Period of a Neuron