1. Structural support. The skeletal system provides a framework for the body and gives it shape. It supports the weight of the body, allowing us to stand, walk, and move around.

2. Protection. The skeleton protects vital organs, such as the brain, heart, and lungs, from injury. It also encases bone marrow, the tissue that produces blood cell.

3. Storage. The bones store minerals, such as calcium and phosphate. When blood levels of these minerals are low, they can be released from the bone.

4. Movement. The skeleton provides an attachment for muscles, which make it possible to move parts of the body.