BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Heart. Artwork of a vertical-diagonal cross- section through the heart showing the two right- hand-side chambers. The top chamber (upper left) is the atrium. It receives deoxygenated blood from the body via the vena cava (blue, upper left), the body's main vein. The blood is pumped into the lower chamber (lower right), the ventricle, and then to the lungs, via the pulmonary artery (blue, upper right), to be oxygenated. From the lungs the blood enters the left side of the heart and is pumped around the body via the aorta (red, upper left).
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