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MCAT Question A Day - 9/2/14 - Answer!

Wheonopair of antagonistimuscles contractswhausually happento the other muscle to produce movement?

A.  Iacts synergisticallby contractintstabilize the moving bone.
B.  It relaxes to allow movement.
C.  It contracts ian isometric action.
D.  Its insertioslidedowthbone to allow largerangof movement.

B is correct. Antagonistic muscles move bones in opposite directions relative to a joint. In order to produce movement, one must relax while the other contracts.

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