When the biceps brachii contracts, the wrist moves closer to the shoulder. This movement is called

When the biceps brachii contracts, it bends the elbow, bringing the forearm and wrist closer to the shoulder. Bending a joint and decreasing its angle is called flexion, so the correct choice is flexion. Extension would straighten the elbow; adduction and abduction describe movement toward or away from the body's midline.

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