They are connected to our bones. They move our arms and legs when we jump, run or lift things.
muscles
It is made of 33 bones. It helps you stand up tall.
spine
They are inside your chest. When you breathe in, they fill with air.
lungs
It tells other parts of your body what to do.
brain
It protects your brain.
skull
They protect heart and lungs.
ribs
It pumps blood through the body.
heart
