Without your skeleton your body would be like jelly.
Your bones support your body and protect your vital organs.
Rib cage protects heart and lungs
When you were born, you had around 300 bones.
Babies have 300 bones
But as you grow up, some of your bones fuse together, so by the time you're an adult you've more like 200 bones.
Adults have 200 bones
Your bones are actually organs, and although they don't contract like your muscles do, they are very much alive.
They are growing, living tissue, which is constantly renewed throughout your life.
Over a period of about seven years, each bone in your body is slowly and completely replaced.
Tissue generates whole new bones
Your bones contain blood vessels, nerve cells, and living bone cells called osteocytes.
These are held together by a framework of hard, non-living material, containing calcium and phosphorus.
Bone tissue can also change and adapt with use.
If you play a lot of squash, the bones in your hitting arm will grow to be larger and stronger.
You have many different shapes of bone in your body, specialised for different functions.
The spine is made up of 26 bones shaped like rings.
They hold your body upright, allow you to twist and bend, and protect the important nerves in your spinal cord.
Your skull is made up of different bones that protect your brain and make up the structure of your face.
22 bones make your skull
Most fuse to form the cranium
Our bones may go unnoticed, but they are the most irregular, large, small, and plentiful organs in the human body...
And are the only things left, long after the rest is gone.