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(A) For a stimulus to be effective in initiating a nerve impulse,it must reach a minimum intensity known as the $threshold$ $stimulus$.If the stimulus

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Less than the threshold value

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(A) For a stimulus to be effective in initiating a nerve impulse,it must reach a minimum intensity known as the $threshold$ $stimulus$.If the stimulus intensity is less than the $threshold$ $value$,it fails to trigger the opening of voltage-gated $Na^+$ channels,and thus,no action potential is generated.Therefore,the value of the potential must not be less than the $threshold$ $value$ to start the conduction of an impulse.

To start the conduction of an impulse,the value of the action potential must not be

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