JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY JEANETTE ENGQVIST / SCIENCE PHOTO LIBRARY
Blood flow in the heart. Computer illustration showing the path (arrows) blood takes through a human heart. Deoxygenated blood enters the right atrium, passing through the tricuspid valve into the right ventricle. Blood travels to the lungs via the pulmonary arteries and back to the left atrium via the pulmonary veins. Passing through the mitral valve, the left ventricle pumps the oxygenated blood into the aorta to supply the entire body.
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