ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Blood vessels and kidneys. Computer artwork of a man with healthy blood vessels and kidneys. The kidneys are at lower centre. The blood is pumped around the body by the heart (centre) and its waste products are filtered out by the kidneys. These then process the waste and pass them to the bladder (not seen), which excretes them as urine.
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