From the Children's Heart Institute, a diagram comparing a heart to a house.

Thinkquest site provides detailed information with graphics and concise explanation about the workings of the human blood and the circulatory system. Includes safety tips to follow at home as well as interactive forums.

This is the story of a handful of brilliant, obsessed surgeons and researchers who pursued the target of a practical artificial heart for decades. Includes heart facts, an overview of a heart transplant, and artificial heart technology.