When pairs of muscles work in opposite directions to move a limb?

When pairs of muscles work in opposite directions to move a limb, they are referred to as antagonistic muscles. One muscle, known as the agonist, contracts to produce movement, while the opposing muscle, the antagonist, relaxes to allow that movement to occur. This coordinated action enables smooth and controlled motion, as seen in activities like bending and straightening the arm. For example, when you flex your bicep, the tricep acts as the antagonist, relaxing to facilitate the movement.