The Absolute Refractory Period Occurs Because

question 169

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 cell regains its resting potential.​

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