Skeletal System

The skeletal system forms redblood cells; stores calcium and phosphorus; provides shape, support, protection, and movement. The average adult body has 206 bones. Your bone work with muscles to help you move. The also help you keep a stable homeostasis by storing minerals and creating blood cells. The bone looks simple and useless but it is made up of tissues. They are made of connective and minerals. There are two type of bone tissues. If you can't see any visible spaces then it is a compact bone. The bone that has visible openings is called a spongy bone. Spongy bone provides most of the strength and support. Before your bone becomes hard it is a soft tissue called cartilage. When babies are born they don't have a lot bones. As you get older and bigger your cartilage is replaced by strong bones. Two places where your cartilage never gets replaced is in the ear and and the end of your nose. A place where tow or more bones meet is called a joint. A joint lets you move when your muscles contract. Fixed joints let no movement or barely any movement at all. There are three types of joint, gliding, ball-and-socket, and hinge. Then, joits are held together by ligaments. Ligaments are strong elastic bands of connective tissue. Ligaments connect the bone to a joint.