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News in Physiological Sciences, Vol 2, 22-26, Copyright © 1987 by International Union of Physiological Sciences
ARTICLES |
JA Schafer
Fluid absorption in the proximal tubule can be driven by a small osmotic difference between the luminal and interstitial fluids because this leaky epithelium has a high water permeability. The osmotic difference is produced by solute absorption, which tends to dilute the luminal fluid and concentrate the interstitial fluid. However, important questions remain unanswered regarding the pathway for water flow and the role of hemodynamic and humoral factors.
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