The relative 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.
Answer: A
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