The Skeletal system is the  the collection of bones that holds the rest of our body up. Our skeleton  does three major things It protects our vital organs such as the brain, the heart and the lungs. It gives us the shape It allows us to move. Because our muscles are attached to our bones Our  skeleton had around 350 bones when we are born. Adults have around 206 bones because, as wegrow, some of the bones join together to form one bone.