From the skin that covers us to the heart that pumps the blood, the human body is a complex machine whose parts must work together to keep us healthy and alive. Each title in the new The Human Body: How It Works set investigates a different system or process of the human body, from organ systems to cells. Written by experts in human anatomy and accompanied by full-color photographs and illustrations and charts and diagrams, these new titles thoroughly examine each system's role in keeping the human body moving.