The skeletal system is made up of bones, ligaments, and tendons. It shapes the body and protects organs. The skeletal system works with the muscular system to help the body move. There is a fatty part located inside the bone called the marrow. It produces red blood cells, white blood cells, and immune cells to help the body. The biggest bone in the body is the thigh bone.The smallest is the stirrup, which is in the ear.

Skeletal System