The bones of the skeletal system are divided into two major divisions: the axial and the appendicular skeletons. In addition to bones, the skeletal system consists of cartilage, tendons, and ligaments. The skeletal system provides support for the body, protects internal organs, serves as attachments for muscles to produce movement, stores minerals such as calcium, and produces new blood cells. Bones are used as landmarks for procedures such as injections, electrocardiograms, and x-rays. It is important for medical assistants to have knowledge of this system in order to effectively perform their duties.