nephron

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nephron

A Dictionary of Nursing | 2008 | Â© A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

nephron (nef-ron) n. the active unit of excretion in the kidney (see illustration). Blood is filtered through the glomerulus into the Bowman's capsule so that water, nitrogenous waste, and many other substances pass into the renal tubule. Here most of the substances are reabsorbed back into the blood, the remaining fluid (urine) passing into the collecting duct, which drains into the ureter.

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"nephron." A Dictionary of Nursing. Oxford University Press. 2008. Encyclopedia.com. 9 Nov. 2009 <http://www.encyclopedia.com>.

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nephron

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

nephron Functional unit of the mammalian kidney. There are c.1 million nephrons in a human kidney. Each consists of a cluster of tiny blood capillaries, cupped in a structure with an attached, narrow tubule. Blood enters the kidney under pressure, and water and wastes are forced into the tubule. Some water and essential molecules are reabsorbed into the bloodstream; the remaining filtrate, urine, is passed to the bladder.

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nephron

A Dictionary of Zoology | 1999 | | Â© A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

nephron One of the units in the vertebrate kidney that extracts metabolic wastes which are discharged as urine. The Bowman's capsule, at one end of the nephron, receives many blood constituents, and the loop of Henlé extracts water and some salts. See COUNTER-CURRENT EXCHANGE.

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MICHAEL ALLABY. "nephron." A Dictionary of Zoology. 1999. Encyclopedia.com. 9 Nov. 2009 <http://www.encyclopedia.com>.

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