"Did you know that there are more than 600 named muscles in the human body? The muscular system makes up about 50 percent of the body's weight. Discover more fascinating facts in How the Human Body Works - The Muscular System. This series guides readers through the fascinating inner workings of the human body. The human body contains several complex systems that work closely together to support life and allow the body to function properly. Each book explores the characteristics and interactions of these systems, their makeup, and their importance"-- Provided by publisher.

Includes index.

How does it work? -- The head and neck -- The chest and back -- Arms and hands -- Legs and feet -- Keeping healthy -- Studying the muscular system -- Working together -- Careers.