The main function is that the bones move they also keep you up.
Skull is like a head gear it will protecte your brane from getting hurt. And the spine is an portant bone if you did not have a spine you will fall over.
What each part does.
Each bone in your body move.
How does this systems affect each other.
Each bone affects each other by rubbing, and braking.
we have 326 bones in your. Joints have sevel parts