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Which of the Following Statements About the Refractory Period of Nerve

Question 38

Multiple Choice

Which of the following statements about the refractory period of nerve or muscle membranes is correct?

A) In nerve cells, the absolute refractory period coincides with the period of increased K⁺ permeability
B) In skeletal-muscle cells, the absolute refractory period lasts almost as long as the twitch
C) In ventricular cells, the absolute refractory period coincides with the period of increased Na⁺ and Ca2⁺ permeability
D) Both in nerve cells, the absolute refractory period coincides with the period of increased K⁺ permeability and in skeletal-muscle cells, the absolute refractory period lasts almost as long as the twitch are correct
E) Both in skeletal-muscle cells, the absolute refractory period lasts almost as long as the twitch and in ventricular cells, the absolute refractory period coincides with the period of increased Na⁺and Ca2⁺ permeability are correct

Correct Answer: