The skeletal system contains all the bones and joints in the human body. The skeletal system also provides support and protection for the soft tissue that makes up the rest of the body. Red blood cells form within the bone marrow, which also contains millions of cells, protein fibers and minerals.
The skeletal system is what gives human beings the ability to stand upright and move around. The skeletal system also protects internal organs from damage and stores fat and essential minerals. There are 206 individual bones in an adult body contained in the upper limbs, lower limbs, pelvic girdle and pectoral girdle. The skull has 21 bones that are fused together and a jaw bone that forms the only movable joint in the skull. There are five main categories of bones, including long bones, short bones, flat bones, irregular bones, sesamoid bones and structural bones. Each bone type develops in different locations in the human body and performs different functions. The two main types of bone tissue are compact and cancellous tissue. Compact tissue forms on the outer shell of bones, whereas cancellous tissue develops beneath the compact bone and consists of a meshwork of bony bars, called trabeculae, with many interconnecting spaces containing bone marrow, according to IvyRose.