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Illustration of a nephron, the functional unit of excretion in the human kidney. As a blood filtering system, a nephron is richly supplied with capillaries from branches of the renal artery (red) and vein (blue). At centre right, a knot of capillarie

Illustration of a nephron, the functional unit of excretion in the human kidney. As a blood filtering system, a nephron is richly supplied with capillaries from branches of the renal artery (red) and vein (blue). At centre right, a knot of capillarie

Illustration of a nephron, the functional unit of excretion in the human kidney. As a blood filtering system, a nephron is richly supplied with capillaries from branches of the renal artery (red) and vein (blue). At centre right, a knot of capillaries (the glomerulus) is surrounded by Bowman's capsule (blue). It is here that excretory products are filtered from the blood, and pass into a convoluted tubule (yellow). Urine is concentrated in this tubule, particularly in the thin loop of Henle (at bottom) with useful products reabsorbed into the blood. A collecting duct (left) passes this urine to the ureter, then bladder.
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42-51778099
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