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all-or-none law

[awl-er-nuhn] /ˈɔl ərˈnʌn/
noun, Physiology.
the principle that under given conditions the response of a nerve or muscle fiber to a stimulus at any strength above the threshold is the same: the muscle or nerve responds completely or not at all.
Origin of all-or-none law
1895-1900 Unabridged
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all-or-none law in Medicine

all-or-none law n.
The principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will either give a complete response or no response at all.

all'-or-none' adj.
The American Heritage® Stedman's Medical Dictionary
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