See how the human heart moves blood through the body in this animated feature from the NOVA: "Cut to the Heart" Web site.

A digital diagram from Digital Frog of the circulatory system of a frog. Very nice, and very fake since it is not a real frog.

A downloadable PDF comic book in Spanish with information on how to prevent heart disease and promote healthy hearts.

Learn how our body works at this personal site from a fourth grade teacher. Colorful graphics and lots of fun facts.

This resource from Khan Academy provides information about strokes.

This feature from the NOVA: "Cut to the Heart" highlights facts about the heart, including its size and placement, and will help you to understand the importance of this wondrous organ in our bodies.