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 cell regains its resting potential.

Question

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 cell regains its resting potential.​

Quizplus · Accepted Answer

During the absolute refractory period, sodium channels cannot reopen until the cell regains its resting potential. This prevents another action potential from being generated during this time, even with a large stimulus.

The Absolute Refractory Period Occurs Because