The bone of the upper arm.

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Multiple Choice

The bone of the upper arm.

Explanation:
The bone of the upper arm is the humerus. It’s a long bone that spans from shoulder to elbow, connecting the shoulder girdle to the forearm. Its proximal end features a rounded head that fits into the shoulder socket, with tubercles for muscle attachments, and the distal end forms the elbow joint with the forearm bones—the capitulum interfaces with the radius and the trochlea with the ulna. This distinguishes it from the radius and ulna, which are in the forearm, and from the fibula, which is in the leg.

The bone of the upper arm is the humerus. It’s a long bone that spans from shoulder to elbow, connecting the shoulder girdle to the forearm. Its proximal end features a rounded head that fits into the shoulder socket, with tubercles for muscle attachments, and the distal end forms the elbow joint with the forearm bones—the capitulum interfaces with the radius and the trochlea with the ulna. This distinguishes it from the radius and ulna, which are in the forearm, and from the fibula, which is in the leg.

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