"Did you know that there are around 60,000 miles (95,500 kilometers) of blood vessels in the human body? More than half of the body's blood is made of a substance called plasma. Discover more fascinating facts in How the Human Body Works - The Cardiovascular 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.

Human body systems -- What is the cardiovascular system? -- Cardiovascular system features -- How does it work? -- The heart -- The upper body -- Arms and hands -- Legs and feet -- Keeping healthy -- Studying the cardiovascular system -- Working together -- Careers.