The action potential is called an all-or-none response because if the threshold potential is surpassed,the full peak of the action is always reached; if the threshold potential is not surpassed,no action potential will occur.

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This is because the opening of voltage-gated ion channels in response to depolarization is an all-or-none phenomenon. Once the threshold potential is reached, a full action potential will be generated, regardless of how strong the depolarizing stimulus was. If the threshold potential is not reached, no action potential will occur.

The Action Potential Is Called an All-Or-None Response Because If