Final answer:
The biceps and triceps brachii are not muscles that extend and flex the shoulder joint; instead, they move the arm at the elbow joint.
Explanation:
False
The biceps and triceps brachii are not muscles that extend and flex the shoulder joint; instead, they are a pair of muscles that move the arm at the elbow joint. The biceps brachii is the flexor, while the triceps brachii is the extensor. These muscles act as antagonistic pairs, with the biceps closing the limb while the triceps opens it.
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