Kidneys. Coloured computer artwork of a section through healthy human kidneys. The kidney is divided into an outer cortex and the pyramid-shaped units of the inner medulla. Blood is passed into a network of capillaries in the cortex 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 into tubules, where the waste turns to urine. The urine then drains through the medullary pyramids into the ureter which leads to the bladder.
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