Antagonists are muscles that resist the action of and cause movement in the opposite direction.

Prime movers.

Explanation:

Antagonist muscles are the muscles that oppose the action of other muscles. Biceps and triceps muscles acts as antagonist muscles.

Antagonist muscles mainly resist or oppose the action of prime movers of the muscle. These muscles produce the opposite action of the agonist muscles. Agonist muscle is also known as prime movers.

Thus, the answer is prime movers.

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the ileocecal valve (also called bauhin valve), which limits the rate of food passage into the cecum and may prevent material from returning to the small intestine.