The Absolute Refractory Period Occurs Because

question 3

Multiple Choice

 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.

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