The main purpose of the skeletal system is to provide structural support and protection for the body's organs, while also facilitating movement. The skeletal system consists of bones, cartilage, ligaments, and joints, working together to form a framework that supports the body's shape. This system serves several critical functions: it protects vital organs (such as the brain, heart, and lungs), supports posture, and facilitates mobility by acting as levers for muscles. Additionally, it plays a role in mineral storage (like calcium and phosphorus) and houses bone marrow, which is responsible for blood cell production.