ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Kidney. Computer graphic of a section through a whole human kidney. At upper left is the renal artery and vein which supply blood to, and drain blood from the kidney. The artery forms a network of capillaries in the cortex of the kidney, ending in small tight knots called glomeruli (not seen). Glomeruli are blood filtering units from which excess water and metabolic wastes pass from the blood to nephrons, long tubules seen in the outer kidney. Nephrons filter these waste products into urine. The urine then drains into collecting ducts of each nephron, and finally into the ureter (at lower left). The ureter is a tube which passes urine into the bladder.
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