Muscles often attach to two different bones, so that when the muscle flexes and shortens, the bones move. The movement of our bodies is possible because of both joints and muscles. This type of joint lets you rotate your shoulder in many directions, or swing it all the way around in a circle like softball pitchers do. Other bones fit together like a ball and socket, such as the joint between your shoulder and arm. How many different ways can you move your joints? Some bones, like your elbow, fit together like a hinge that lets you bend your arm in one specific direction. The place where two bones meet to allow your body to bend is called a joint. Each bone has a very specific shape which often matches up with neighboring bones. Movement: Many of your bones fit together like the pieces of a puzzle. For this purpose, being "thick-headed" is a very good thing. The thick bone layer of your skull protects your brain. Your brain is another organ that needs a lot of protection. Your rib cage, for example, acts like a shield around your chest to protect important organs inside such as your lungs and heart. Protection: Bones form a strong layer around some of the organs in your body, helping to keep them safe when you fall down or get hurt. Without bones, it would be difficult for your body to keep its shape and to stand upright. Support: Like a house is built around a supportive frame, a strong skeleton is required to support the rest of the human body. Click on the image to see a larger version.
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