BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Heart anatomy. Artwork of a posterior (from behind) view of a normal heart, sectioned to show the internal anatomy. The red arrow shows the normal flow of blood from the left ventricle (at left) into the ascending aorta (curving to upper left). Above the ventricles are the other two heart chambers, the left and right atria respectively. Between each atrium and ventricle are atrioventricular valves (white): the mitral valve (left) and the tricuspid valve (right). The left ventricle has particularly thick walls of cardiac muscle (myocardium), because it is this chamber that pumps blood around the body.
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