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METHODS erythrocyte; renal medulla HUMAN RED BLOOD CELL contains many systems for moving ions and nonelectrolytes across its membrane. Many of these systems have been shown to be important for the physiological functions of the whole organism as well as the cell itself. The discovery that and water movements are independent (11,12) and that follows facilitated kinetics rather than passive diffusion kinetics (L. Wadzinski and R. Macey, unpublished observations, 1,9,14,22) is puzzling when viewed from a teleological perspective. Why should the red blood cell evolve a system to move ly across its membrane when the average concentration in the blood is normally so low? In this paper, we give a plausible advantage for evolution of this system. In the kidney, where the vasa recta capillaries dip down into the medulla exposing the cells to high salt and concentrations, the cells would be close to hypertonic hemolysis at the medullary tip and emerge from the medulla loaded with and swollen if a fast system were not present. Our aim is to compare cell volume and internal concentration as cells move through and out of the vasa THE Simple diffusion case. As a red blood cell descends into the renal
AJP - Cell Physiology – The American Physiological Society
Published: May 1, 1988
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