MEDICAL PHYSIOLOGY

Detailed explanation-1: -Antagonistic Muscle is a muscle that opposes the action of another. For example, when the triceps oppose the contraction of the flexing biceps by relaxing, the triceps would be regarded as the antagonistic muscle to the biceps whereas the biceps, the agonist muscle.

Detailed explanation-2: -A structure which has been moved by a muscle cannot return to its original position without the action of another muscle. Such muscles causing opposing movements are called antagonistic muscles. For example, the biceps muscle of the upper arm bends the lower arm over the upper arm.

Detailed explanation-3: -A muscle with the opposite action of the prime mover is called an antagonist.