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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?
During an absolute refractory period, the axon needs a stronger-than-usual stimulus to fire another action potential.
During a relative refractory period, it is impossible for the axon to fire another action potential.
The relative refractory period is due to the inactivation of sodium channels.
The absolute refractory period is due to the inactivation of sodium channels.