"In graphic novel format, follows Ruby the red blood cell as she travels through and explains the workings of the human circulatory system"--

Text and images describe the circulatory system.

Text and illustrations explain the purpose, parts, and function of the circulatory sytem.

Describes the anatomy and functions of the human circulatory system and how it responds to increased activity, the microgravity of space, and other changes.

Ms. Hansen and the Explorers are very interested in learning--they want to know everything they can about the human body. But they aren't alone! The Zelmans, Xe