agonist muscle definition
Noun. 1. 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.antagonist-a muscle that relaxes while another contracts; when bending the elbow the triceps are the antagonist. physiology-the branch of the biological sciences dealing with the functioning of organisms.oun. 1. 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.