The absolute refractory period occurs because
A) the cell is hyperpolarized, requiring a larger than normal stimulus in order to form another action potential.
B) it takes time for the sodium-potassium pumps to return ion concentrations to the normal resting state.
C) only one action potential at a time can travel the length of an axon.
D) sodium channels cannot reopen until the membrane regains its resting potential.

Question

Quizplus · Accepted Answer

During the absolute refractory period, sodium channels are deactivated and cannot reopen until the membrane regains its resting potential. This prevents the neuron from firing multiple action potentials in rapid succession and allows for proper propagation of the signal along the axon.

The Absolute Refractory Period Occurs Because