The Skeletal System, is made up of bones, cartilage and joints. The skeleton is the hard framework around which the entire body is built. The bones are a rigid and tough form of connective tissue and are the weight-bearing organs of the body. They are responsible for almost all strength of the skeleton. Cartilage provides structure and support to the body's other tissues without being as hard or rigid as bone. It can also provide a cushioning effect in joints. Joints make the skeleton mobile. Teeth are also part of the skeletal system, but they aren’t considered bones.