Antagonist - Definition


An antagonist is any substance, organ, or phenomenon whose action is opposed to all other substances, organs, or phenomena. With regard to the muscles, the movement generated by the antagonist muscle is opposed to the movement of the agonist muscle. During a movement, the agonist is the principal muscle used to complete the movement; the antagonist is at rest while the agonist works. Furthermore, the antagonist muscle is stretched when the agonist muscle is tensed and vice versa. With regard to substances, sometimes antagonist molecules are used to counteract the harmful affects of excess amounts of other molecules, like in the case of intoxication or overdose.


Original article published by Jeff. Translated by Jeff. Latest update on August 19, 2014 at 12:41 PM by christelle.b.
This document, titled "Antagonist - Definition," is available under the Creative Commons license. Any copy, reuse, or modification of the content should be sufficiently credited to CCM Health (
Anoxia - Definition
Antiseptic - Definition