EVERYDAY SCIENCE

Detailed explanation-1: -Your arm is made up of three bones: the upper arm bone (humerus) and two forearm bones (the ulna and the radius).

Detailed explanation-2: -The reasons for 2 bones in your lower arm can be to help your hand turn and give you more control over it. The shoulder joint is a ball and socket joint and has large muscles to help control it. Since the movements and actions of a wrist and shoulder are different, different joints were needed.

Detailed explanation-3: -Anatomy. If you hold your arms at your side with your palms facing up, the ulna is the bone closest to your body and the radius is closest to your thumb. The ulna is larger at the elbow-it forms the point of your elbow-and the radius is larger at the wrist.

Detailed explanation-4: -The ulna is located on the medial side of the forearm, and the radius is on the lateral side. These bones are attached to each other by an interosseous membrane.

Detailed explanation-5: -Each arm of the human body has 30 bones. It has 1 humerus (arm), 1 ulna and 1 radius (forearm), 8 carpals (wrist bones), 5 metacarpals (palm bones), 14 phalanges (5 digits).