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antagonistic muscle - (physiology) a muscle that opposes the action of another; the biceps and triceps are antagonistic muscles. muscle, musculus-one of the contractile organs of the body. agonist-a muscle that contracts while another relaxes; when bending the elbow the biceps are the agonist.ntagonistic muscle - (physiology) a muscle that opposes the action of another; the biceps and triceps are antagonistic muscles. muscle, musculus-one of the contractile organs of the body. agonist-a muscle that contracts while another relaxes; when bending the elbow the biceps are the agonist.
An agonist muscle is the primary mover, the one doing the work. An antagonist muscle is the opposite muscles. As one contracts the other will lengthen. Ex: Bicep curls - the Biceps brachii (shortening, contracting, concentric) would be the agonist and the triceps brachii (lengthening, relaxing, eccentric) would be the antagonist. A synergist would be the brachialis. (That is just one example). A synergist muscle(s) is a helper muscle(s)- they assist the primary with doing the work.....