CARLYN IVERSON / SCIENCE PHOTO LIBRARY CARLYN IVERSON / SCIENCE PHOTO LIBRARY
Blood system. Illustration of a human figure revealing the blood circulation system. The heart, a hollow muscle in the upper chest that pumps blood around the body, is shown magnified at far right. At the top of the heart are the heart's main blood vessels. In general the veins carry deoxygenated blood (blue) towards the heart, while the arteries carry oxygenated blood (red) away from the heart. The fine capillary network (magnified at far left) transports oxygen and nutrients into the tissues. It links the small artery (arteriole, red) to the small vein (venule, blue). The brain, lungs (in upper chest) and kidneys (at centre) are also seen.
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