Which activity gets your heart pumping more: using the computer, climbing the stairs, jumping rope, running, or walking? Youngsters take a heart rate reading after 30 seconds, one minute, and three minutes of each activity. The handout...

Overview of the cardiovascular system with labeled diagrams and reviews of the heart, torso, arm, leg, and blood, available through the links on the right.

The circulatory system and how it functions are explained. An interactive diagram shows how blood flows through the heart. Disorders of the heart and the circulatory system are also described.

Access Excellence offers detailed information, including diagrams and photos, about the anatomy of the heart and its central role in the circulatory system.

This comprehensive study guide covers the main terms and concepts needed for a unit on the circulatory system.

William Harvey, doctor during the Age of Enlightenment, challenged mainstream understanding of the heart and the circulation of blood. Read about his early education and his scientific inquiry.

A very good site about the circulatory system of a bird. It is reader friendly, and includes a fair amount of information. Good diagram of the circulatory system.

This concise PBS NOVA site contains interesting facts about the heart and how it works.

A complete reference tool that serves as an illustrated resource for presenting information on heart conditions. Content includes information on what they are, how the heart works, diagnosis, congenital defects, treatment, and long term...

A concise history of the study of the heart and its anatomy. Includes color pictures and details about the work of Galen, William Harvey, and others.

A detailed description of the human heart and its parts.

One-page overview containing a detailed labeled diagram of the anatomy of the heart including the valves, conduction system, and circulatory system.

A very good description of the blood and circulatory systems of mammals and the important role that blood plays in the physiology of animals.

This article provides information about peripheral arterial disease and claudication (poor circulation) and related health problems it.

In July 2001, a major advancement in medical science was made. Find out about the first completely implanted artificial heart that totally replaced the function of the human heart. Read about what the AbioCor is and view a video on the...

Causes of heart failure, signs and characteristics of heart failure, pathologic conditions resulting in heart failure, and more are the topics addressed in this thorough resource.

How does blood supply your body with the nourishment it needs? This site focuses on systemic circulation. Learn more about this fascinating part of your body when you check out this resource.

An extensive page on the circulatory system in general. Scroll down to section 49.3 and you will find a simple comparison of the reptilian system to the other vertebrae systems.

WebMD offers information on congenital heart disease, including types, symptoms, diagnosis, and treatment.

Read about how your heart works and learn about the different parts of the heart.

An overview of the evolution of modern mamallian circulation. This is a good site since it puts the circulation found in reptiles in perspective. Compares it to systems in fish and mammals.