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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.
Muscles are normally arranged in opposition so that as one group of muscles contract another group relaxes or lengthens. Antagonistic pairs of muscles are muscle where one move the bone in one direction and the other moves it back the other way in transmission of nerve impulses to the muscles.That means that it is impossible to fully stimulate the contraction of two antagonistic muscles at the same time. Our biceps and triceps in the legs are the quadriceps femoris and biceps femoris. 2  Under the knee we have one more important antagonistic pair and thatâs tibialis anterior and soleus muslce.