#1 Protection - your heart and lungs are shielded by your ribs. Your spinal cord is protected by your vertebrae, and your brain is protected by your skull.
#2 Movement - muscles are attached to bones, which are jointed, to produce movement. When the muscles contract, the bones move. Without bones, you would not be able to run, walk, sit or stand.
#3 Blood Production - red blood cells (to carry oxygen) and white blood cells ( to protect against infection) are produced in the bone marrow of some bones
#4 Shape - gives shape to the body and makes you tall or short
#5 Support - holds your vital organs in place when playing sports. The vertebral column holds the body upright.