Our skeleton is made of more than 200 bones. Calcium and other minerals make the bone strong but slightly flexible. Bone is a living tissue with a blood supply. It is constantly being dissolved and formed, and it can repair itself if a bone is broken.
The skeleton has four main functions:
The skeleton supports the body. For example, without a backbone we would not be able to stay upright.
Here are some examples of what the skeleton protects:
Some bones in the skeleton are joined rigidly together and cannot move against each other. Bones in the skull are joined like this. Other bones are joined to each other by flexible joints. Muscles are needed to move bones attached by joints.
There are different kinds of blood cells, including:
These cells are made in the bone marrow. This is soft tissue inside our larger bones which is protected by the hard part of the bone which surrounds it.