all or none

all or none
See Bowditch law.

* * *

(awl or nun) 1. the principle that the heart muscle, under whatever stimulus, will contract to the fullest extent or not at all; stimulation of any single atrial or ventricular muscle fiber causes the action potential to travel over the entire atrial or ventricular mass, or not to travel at all. 2. in muscles other than cardiac muscle, and in nerves, stimulation of an individual fiber causes an action potential to travel over the entire fiber or not to travel at all. Called also all-or-none law.

Medical dictionary. 2011.

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