ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Human kidneys. Computer artwork of two sectioned human kidneys. Humans possess two kidneys, located at the back of the abdomen, responsible for excreting nitrogenous waste from the blood. Each kidney is composed of an outer cortex (thin dark blue outer layer) and an inner medulla (orange, green and light blue). Each receives blood through the renal artery (short dark blue tubes, centre left and right). Nephrons (not seen) in the cortex and medulla filter unwanted substances from the blood, forming urine. The urine is then transported along the ureters (long blue tubes) to the bladder, from where it is expelled from the body.
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