Meet your heart they help deliver blood to your entire body! Join them as they introduce readers to the circulatory system and the lifegiving power of blood. This colorful graphic novel will introduce students to red blood cells, platelets, white blood cells, vessels, the heart, oxygen, body temperature, and blood pressure. Along the way they'll meet William Harvey, the doctor who discovered how blood circulates. An activity in the back of the book encourages readers to learn about their pulse. For more content on the wonders of the body, check out other titles in the Building Blocks of the Human Body series!