- countercurrent mechanism
- countercurrent multiplication mechanism see under multiplication.
Medical dictionary. 2011.
countercurrent mechanism
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Countercurrent exchange — Counter heat current exchange: Note the gradually declining differential and that the once hot and cold streams exit at the reversed temperature difference; the hotter entering stream becomes the exiting cooler stream and vice versa.… … Wikipedia
Countercurrent multiplication — A countercurrent multiplier system is a mechanism that expends energy to create a concentration gradient. It is found widely in nature and especially in mamalian organs. For example, it can refer to the process underlying the process of urine… … Wikipedia
mechanism — 1. An arrangement or grouping of the parts of anything that has a definite action. 2. The means by which an effect is obtained. 3. The chain of events in a particular process. 4. The detailed description of a reaction pathway. [G. mechane, a… … Medical dictionary
countercurrent multiplier — A system in which energy is used to transport material across a membrane separating two c. tubes connected at one end to form a hairpin shape; by this means a concentration can be achieved in the fluid in the hairpin bend, relative to the inflow… … Medical dictionary
countercurrent multiplication — the mechanism in the loops of Henle of the renal tubules by which urine is concentrated; it is dependent upon unique solute transport processes at different parts of the loops of Henle and the vasa recta … Medical dictionary
Courant Institute of Mathematical Sciences — (CIMS) Established 1935 Type Private Academic staff 82 … Wikipedia
Chromatography — Pictured is a sophisticated gas chromatography system. This instrument records concentrations of acrylonitrile in the air at various points throughout the chemical laboratory. Chromatography (from Greek χρῶμα chroma color and γράφειν graphein to… … Wikipedia
respiration — respirational, adj. /res peuh ray sheuhn/, n. 1. the act of respiring; inhalation and exhalation of air; breathing. 2. Biol. a. the sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues and cells,… … Universalium
Heat exchanger — An interchangeable plate heat exchanger Tubular heat exchan … Wikipedia
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
