DAVID GIFFORD / SCIENCE PHOTO LIBRARY DAVID GIFFORD / SCIENCE PHOTO LIBRARY
Heart. Illustration of a section through a whole human heart, showing the internal organization of chambers, valves, connecting arteries and veins. The heart may be regarded as being two pumps: the right side (left on image) serving the lungs and the left side pushing blood around the general circulation. Oxygenated blood entering the heart from the lungs passes through the left atrium into the left ventricle (bottom right) before being distributed via the aorta (top, yellow). Deoxygenated blood enters the right atrium through the vena cavae (top left) prior to being pumped to the lungs from the right ventricle.
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