Which muscle is known as the antagonist?

The antagonist muscle is defined as the muscle that performs the opposite action of the agonist. In any movement, muscles work in pairs: the agonist is the primary muscle responsible for a specific movement, while the antagonist provides balance by opposing that movement. For example, when performing a bicep curl, the biceps brachii is the agonist that flexes the elbow, and the triceps serve as the antagonist, allowing for control over the movement and enabling the arm to straighten when the biceps relax. This interplay ensures smooth and coordinated motion, preventing injury and promoting functional movement patterns.