PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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An action potential:
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Is essential for nerve impulse propagation
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Involves the outflux of negative ions to depolarize the membrane
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Involves the influx of negative ions to depolarize the membrane
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Involves the outflux of positive ions to depolarize the membrane
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Explanation:
Detailed explanation-1: -An action potential propagates along the nerve fiber without decreasing or weakening of amplitude and length. In addition, after one action potential is generated, neurons become refractory to stimuli for a certain period of time in which they cannot generate another action potential.
Detailed explanation-2: -A nerve impulse begins when a neuron receives a chemical stimulus. The nerve impulse travels down the axon membrane as an electrical action potential to the axon terminal. The axon terminal releases neurotransmitters that ca rry the nerve impulse to the next cell.
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