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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.
Antagonistic muscles are found in pairs called antagonistic pairs.  These consist of an extensor muscle, which opens the joint (i.e.  increasing the angle between the two â¦ bones), flexor muscle, which  does the opposite to an extensor muscle.n example of an Antagonistic pair is the contracting of the biceps while the triceps relax. The reverse occurs if the triceps were to contract. Moreover, this is known as the â¦ elbow flexion that consists of the Biceps brachii and Triceps brachii.