MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Torso blood vessels. Historical artwork of a human torso that has been dissected to show major blood vessels. The heart (upper centre) pumps blood to the lungs on either side (to be oxygenated), and then receives the blood returning from the lungs and pumps it round the body through the aorta (the main body artery). Arteries branch out to the neck and arms (top) from the aortic arch. The rest of the aorta passes behind the heart and takes blood downwards to the abdomen and legs. The two kidneys (centre left and centre right) clean the blood. Ureters descend from the kidneys to the bladder (round, bottom centre). Veins return blood to the main body vein (the vena cava, left of aorta) that channels the blood back into the heart. The lung and kidney at left have been dissected.
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