Final answer:
Antagonist muscles oppose the movement generated by agonist muscles, returning limbs to their original position through relaxation.
Explanation:
An antagonist is a muscle that acts in opposition to the specific movement generated by the agonist. It is responsible for returning the limb back to its original position through relaxation.
Antagonistic pairs of muscles are necessary as each muscle can only exert a pulling force, requiring another muscle to pull in the opposite direction. For example, the biceps and triceps muscles work as antagonistic pairs when moving the forearm.
Muscles work in antagonistic pairs to cause bones to move, maintaining body or limb position and controlling rapid movement, as seen in shadow boxing or checking the motion of a limb.
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