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Which muscle relaxes when the arm extends?
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Which muscle relaxes when the arm extends?

User Vrwim
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1 Answer

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triceps

The biceps and triceps act against one another to bend and straighten the elbow joint. To bend the elbow, the biceps contracts and the triceps relaxes. To straighten the elbow, the triceps contract and the biceps relax.
User MaxArt
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