An action potential in a nerve fiber is gener | vedclass

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(B) When a stimulus is applied to a site on the polarized membrane,the permeability of the membrane to $Na^+$ ions increases rapidly.This leads to a m

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More sodium ions enter the nerve fiber than potassium ions leave.

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(B) When a stimulus is applied to a site on the polarized membrane,the permeability of the membrane to $Na^+$ ions increases rapidly.This leads to a massive influx of $Na^+$ ions into the axon from the extracellular fluid.As a result,the inner side of the membrane becomes positively charged relative to the outer side,which is known as depolarization.This rapid influx of $Na^+$ ions is significantly greater than the efflux of $K^+$ ions,causing the reversal of polarity (action potential).

An action potential in a nerve fiber is generated when the $+ve$ and $-ve$ charges on the outside and inside of the axon membrane are reversed because ...........

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