What is action potential?

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

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The electrical potential difference across the plasma membrane at a depolarized site

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(B) When a stimulus is applied at a site on the polarized membrane,the permeability of the membrane to $Na^+$ ions increases. This leads to a rapid influx of $Na^+$ ions,causing a reversal of polarity at that site,which is known as depolarization. The electrical potential difference across the plasma membrane at this depolarized site is called the action potential.

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