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(B) : Action potential is the change in electrical potential that occurs across a plasma membrane during the passage of a nerve impulse.As an impulse

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$Na^+$ ions from extracellular fluid to intracellular fluid

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(B) : Action potential is the change in electrical potential that occurs across a plasma membrane during the passage of a nerve impulse.As an impulse travels in a wavelike manner along the axon of a nerve,it causes a localized and transient switch in electric potential across the membrane from $-60 \ mV$ (resting potential) to $+45 \ mV$.This depolarization is primarily due to the rapid opening of voltage-gated sodium channels.As a result,these channels permit the massive influx of $Na^+$ ions from the extracellular fluid into the intracellular fluid via diffusion,leading to the generation of the action potential.

During the propagation of a nerve impulse,the action potential results from the movement of

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