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.

Look at other dictionaries:

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  • all-or-none — (ôl ər nŭnʹ) adj. Characterized by either a complete response or by a total lack of response or effect, as in neurological action above a threshold: “Nerve impulses follow the All or None Law that is, a nerve impulse generated by a weak stimulus… …   Universalium

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  • all-or-none — adjective occurring completely or not occurring at all • Syn: ↑all or nothing • Similar to: ↑complete * * * | ̷ ̷ ̷ ̷| ̷ ̷ adjective : occurring either completely or not at all : marked either by entire, complete, inclusive, or unqualified… …   Useful english dictionary

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  • all-or-none — adjective Date: 1900 marked either by entire or complete operation or effect or by none at all < all or none response of a nerve cell > …   New Collegiate Dictionary

  • All or none — Requirement that none of an order be executed unless all of it can be executed at the specified price. The New York Times Financial Glossary …   Financial and business terms

  • All or none —   A contract condition that the full amount of an order to buy (or sell) securities be executed at an agreed price. A lesser amount is not acceptable …   International financial encyclopaedia

  • all or none — (AON)  Stock market order prohibiting partial sales or purchases …   American business jargon

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