When the arm is bent at the elbow, the biceps contracts while the triceps
Correct answer: C. relaxes
- A. contracts at the same time
- B. contracts even more strongly
- C. relaxes
- D. detaches from the bone
Explanation
Muscles can only pull, so the flexor biceps and the extensor triceps work as antagonists: one contracts while the other relaxes, and they swap roles when the arm is straightened. Both contracting together would lock the joint.
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About Human Skeleton
The human skeleton provides support, protects organs, enables movement with muscles and stores minerals while bone marrow produces blood cells. Questions cover the axial and appendicular skeleton, types of bones and joints, cartilage, ligaments and tendons, and the difference between fixed, slightly movable and freely movable joints.
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