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ART FOR SCIENCE / SCIENCE PHOTO LIBRARY ART FOR SCIENCE / SCIENCE PHOTO LIBRARY
Nephron structure. Artwork showing the structure of a nephron, the functional filtering unit of a kidney. The function of the kidney is to filter waste products such as urea from the blood. The blood arrives in an arterial blood vessel (red) and leaves in a venous blood vessel (blue). The filtration occurs in the renal corpuscle (upper left) where a glomerulus (red capillary bundle) is encased in a Bowman's capsule (light brown). Waste products drain through the convoluted proximal tubules, the loop of Henle (bottom, where water is reabsorbed), and into a collection tube (right). Each human kidney contains around one million nephrons.
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