Here is the basic internal anatomy of the human heart.
It consists of 2 sides (Right and Left)...
4 chambers (Right atrium, Right ventricle, Left atrium, Left ventricle)
4 valves (Tricuspid valve, Mitral valve, Pulmonary valve, Aortic Valve)
4 major blood vessels (Superior/inferior vena cavae, Pulmonary Vein, Pulmonary Artery, Aorta)
The following applet, on the National Heart, Lung and Blood Institute.gov website, has several movies showing the circulation of the blood, and various problems that can occur with it. YOUR JOB is to watch the following movie, WRITE DOWN the major parts of the heart, and DEFINE them. You do NOT have to diagram the heart (for this homework).
See the following link for the applet: http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html