Diagram of the human heart 1. Superior Vena Cava 2. Pulmonary Artery 3. Pulmonary Vein 4. Mitral Valve 5. Aortic Valve 6. Left Ventricle 7. Right Ventricle 8. Left Atrium 9. Right Atrium 10. Aorta 11. Pulmonary Valve 12. Tricuspid Valve 13. Inferior Vena Cava (Photo credit: Wikipedia)

From http://www.interactive-biology.com

In this video, I go through the process of how blood flows through the heart. It shows blood entering via the vena cave to the Right atrium, then getting pumped into the right ventricle, to the pulmonary vein to the lungs, to the left atria, left ventricle and then via the aorta to the rest of the body.

Enjoy!