Renal Transport of Urea

  • F. Roch-Ramel
  • G. Peters
Part of the Proceedings in Life Sciences book series (LIFE SCIENCES)

Abstract

Urea is the main excreted endproduct of nitrogen metabolism, present in notable amounts in the body fluids, in elasmobranch fishes, semi-aquatic amphibians and in mammals. The movements of urea between different compartments of body fluids are usually described by three dogmatic statements: (1) Biological membranes are generally “freely” permeable to urea or, in other words, are practically as permeable to urea as to water. (2) The main exceptions to this rule are (a) a number of membranes constituting the blood brain barrier which are definitely less permeable to urea than to water and (b) a number of membranes constituting the wall of the renal tubules which, at least in part, must be less permeable to urea than to water in order to produce the relatively high concentration of urea in urine to which urea owes its discovery as well as its name. (3) All movements of urea across biological membranes freely permeable to this solute or not occur by free diffusion; there are no known membrane carriers for urea.

Keywords

Depression Sodium Chloride Cortisol Gall Convolution 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1981

Authors and Affiliations

  • F. Roch-Ramel
  • G. Peters
    • 1
  1. 1.Institut de PharmacologieUniversité de LausanneLausanneSwitzerland

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