The primary function of the skeletal system is to provide structural support and protection for the body. It serves as the framework that maintains the shape of the body, allowing for movement and anchoring muscles. The skeletal system also plays a vital role in protecting vital organs, such as the skull safeguarding the brain and the ribcage protecting the heart and lungs. Additionally, bones are involved in the production of blood cells within the bone marrow and serve as a reservoir for minerals like calcium and phosphorus, essential for various metabolic functions in the body.