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More Than 475 Free MCAT Questions with Detailed Answers!

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MCAT Question A Day - 7/14/13

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

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