ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Chest blood vessels. Coloured composite of a 3-D magnetic resonance angiography (MRA) scan of human chest blood vessels (white/pink), with an X-ray of the lungs (blue/black). The aortic arch (upper centre) carries oxygenated blood out of the heart and into the descending thoracic aorta (to bottom centre). The two branches of the pulmonary artery (centre left and right) carry deoxygenated blood from the heart to the lungs. Oxygenated blood returns from the lungs in the two branches of the pulmonary vein (lower left and right). The internal and external jugular veins (top centre) drain deoxygenated blood into the vena cava (upper left), which returns it to the heart.
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