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Practice MCAT Question - Q97 - Answer!

The biceps brachii muscle flexes the lower arm, whereas the triceps brachii extends the lower arm. What relationship do these muscles have to each other?

A.  Agonists
B.  Synergists
C.  Prime movers
D.  Antagonists


The correct answer is (D). When muscles perform opposite actions, they are considered antagonists. The terms agonist and prime mover are synonymous for the muscle that does most of the work for a specific movement. Synergists assist the prime mover.

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