The Skeletal System Skeletal system determines the shape or the body, and protects the organs. It works closely together with the muscular system to allow us to move. Contents: Introduction: Skeletal system is made up of your bones, ligaments, and tendons. It determines the shape and symmetry of the body; acts as a protective device for your organs; acts as a firm base for the attachments of muscles (without bones, your muscles would not function properly); and the marrow tissues in the cavity of the bones produces red cells and some white cells, required in your blood. Endoskeleton: Human have an endoskeleton, meaning that they a