JOHN DURHAM / SCIENCE PHOTO LIBRARY. JOHN DURHAM / SCIENCE PHOTO LIBRARY.
Light micrograph (MSB stain, longitudinal section) of a baby's kidney, showing several glomeruli. The glomeruli, tight knots of blood capillaries surrounded by Bowman's spaces, are the principal filtering units of the kidney. Excess water & metabolic waste are filtered from the blood & passed to the renal tubules, seen here surrounding the glomeruli, where some reabsorption of water & molecules occurs. The highly convoluted tubules are attached at one end to glomeruli & at the other to collecting ducts, which discharge the filtrate (urine). The black dots are cell nuclei. Magnification X400 (at 35mm size).
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