What is the largest bone of the arm that extends from the elbow to the shoulder?

• A. Radius
• B. Humerus
• C. Ulna
• D. Sternum

Answer: (B)

The largest bone of the arm, extending from the elbow to the shoulder, is the humerus. This bone plays a critical role in the arm's structure and function, as it connects at the shoulder joint with the scapula and at the elbow with both the radius and ulna, which are the forearm bones. The humerus supports a wide range of motion in the shoulder and transmits forces from the upper arm to the rest of the body during various activities, such as lifting and throwing. Its significant length and robust structure are essential for the arm's strength and mobility. The radius and ulna are smaller bones situated in the forearm, while the sternum is part of the rib cage and does not pertain to the arm itself.