Bones are living, growing tissues. What are they made of and how do they develop from young to old?
- Bones support the body and protect vital organs.
- When you are born you have around 300 bones, which fuse to form the adult skeleton made up of 200 bones.
- Bones contain blood vessels, nerve cells and living bone cells called osteocytes.
- The outer, hard framework of bones is made of phosphorus and calcium.