Includes index.

Human body systems -- What is the circulatory system? -- Circulatory system features -- How does the circulatory system work? -- The heart -- The body -- Blood types -- Blood pressure -- Keeping healthy -- Studying the circulatory system -- Working together -- Careers -- The circulatory system quiz.

"Circulatory System 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. Circulatory System explores the characteristics and interactions of this system, its makeup, and its importance"--

Grades 4 to 6.