What is the uppermost and largest bone of the arms?

The uppermost and largest bone of the arms is the humerus. This bone is often referred to as the upper arm bone and plays a crucial role in the skeletal structure of the arm. It extends from the shoulder to the elbow, providing support and facilitating a wide range of arm movements. The humerus connects with the scapula at the shoulder joint and articulates with the radius and ulna at the elbow, acting as a key structural component in the arm’s mobility and strength.

This option is correct because of the specific anatomical position and size of the humerus compared to the other bones listed. The radius and ulna are both located in the forearm, beneath the humerus, and are smaller in size, while the sternum is a bone located in the chest, not the arm.