Kidney glomerulus, SEM

Kidney glomerulus, SEM

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Credit: DENNIS KUNKEL MICROSCOPY/SCIENCE PHOTO LIBRARY

Caption: Kidney glomerulus (podocytes and capillaries of the renal corpuscle), coloured scanning electron micrograph (SEM). The glomerulus consists of a tightly coiled network of capillaries surrounded by podocytes. There about 1 million glomeruli in each kidney. Podocytes have narrow cell extensions (processes) that in tern give rise to secondary extensions called pedicels. The podocytes completely surround the capillary system. As blood passes through each glomerulus, water and metabolic wastes are filtered through capillary walls by the surrounding podocytes. About 100 litres of blood are filtered every hour. The water and waste pass into the lumen of the Bowman's capsule. From the capsule the water and waste drains into the surrounding tubules where reabsorption occurs. Magnification: x800 when shortest axis printed at 25 millimetres.

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Keywords: 20518e, blood filtration, blood filtration unit, capillaries, capillary, colored, coloured, erythrocyte, erythrocytes, false-colored, false-coloured, glomeruli, glomerulus, haemoglobin, human, human blood, human body, human kidney, kidney, kidney glomerulus, medical, medulla, pedicel, pedicels, podocyte, podocytes, renal corpuscle, scanning electron micrograph, sem, urinary system, visceral epithelium

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