Action Potentials Only Go in One Direction,away from the Cell

question 13

Multiple Choice

Action potentials only go in one direction,away from the cell body,because 

• A)the adjacent prior segment of axon is still at +40mV. 
• B) voltage-dependent gates are limited in the frequency with which they can open.​ 
• C) the adjacent prior segment is still in refractory period.​ 
• D) the action potential temporarily disables the sodium-potassium pumps.​

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