The shape of your body comes from your bones. That’s because everything is held inside your skeleton, which is made up of them.
You won’t normally see the outside of a bone, but if you could, you’d see the cortical. This is the smooth but very strong part. Underneath you’ll find lots of layers of cancellous bone, which is like a hard sponge. In some bones, you’ll also find bone marrow. This is a thick, sticky substance that makes blood cells. Most of the calcium in your body is in your bones and teeth.
A joint is the area where two or more bones meet. Some of your joints will only bend in one direction, while others can move in lots of different directions such as your hip and shoulder joint.
Did you know?
There are more than 200 bones in your body, and your feet are made up of one quarter of all the bones in your body. Wow!
