Book excerpt: Readers will bone up on their knowledge of the human body with this enlightening text about the skeletal system. The skeleton forms framework for the entire body. It protects the organs, stores minerals, and makes it possible for the body to move and function. Readers will study the parts of the skeletal system, learn about types of bones, and discover how the body changes over time. Useful diagrams help readers visualize abstract concepts, and attention-grabbing photographs enrich the comprehensive text.