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.
a
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