National Health Museum
Access Excellence: The Heart and the Circulatory System
Access Excellence offers detailed information, including diagrams and photos, about the anatomy of the heart and its central role in the circulatory system.
PBS
Pbs Learning Media: Map of the Human Heart
See how the human heart moves blood through the body in this animated feature from the NOVA: "Cut to the Heart" Web site.
University of Utah
University of Utah: Cardiovascular Pathology Index
This site features a detailed index of photographs for cardiovascular pathology. You can see what a normal human heart looks like and what a sick one looks like too. Come and check it out.
PBS
Nova Online: Map of the Human Heart
This PBS site has a concise explanation of how the heart works. There is also a moving diagram of a working heart.
Treehut
Suzy's World: Heart
Find out why your heart beats and perform an experiment to see your pulse moving.
Science Bob Pflugfelder
Science Bob: Body Zone: The Heart
An introduction to the different regions of the heart, along with a description of the hearts function. A good overview site.
Other
Royal Children's Hospital Melbourne: Normal Heart
This resource discusses the various parts of the heart that make it work. A labeled diagram is also provided.