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​An action potential has an absolute refractory period as well as a relative refractory period.

Which of the following is CORRECT about these two types of refractory periods?

A

During an absolute refractory period, the axon needs a stronger-than-usual stimulus to fire another action potential.

B

During a relative refractory period, it is impossible for the axon to fire another action potential.

C

The relative refractory period is due to the inactivation of sodium channels.

D

The absolute refractory period is due to the inactivation of sodium channels.

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