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.
Other
World Invisible: The Human Circulatory System: Blood Circulation
A labeled diagram of the major veins and arteries in the human body.
BBC
Bbc: Ks2 Bitesize: Science: Circulation
Background information review of key concepts about the circulatory system, including the heart and pulse. Tis site provides diagrams, activities, and quiz questions.
Other
Digital Frog: Frog Circulation
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.
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.