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Read e-book online Advances in Comparative and Environmental Physiology: Volume PDF

By A. D. C. Macknight (auth.), Professor Dr. R. Gilles, Dr. E. K. Hoffmann, Dr. L. Bolis (eds.)

ISBN-10: 3642762263

ISBN-13: 9783642762260

ISBN-10: 364276228X

ISBN-13: 9783642762284

Advances in Compararative and Environmental Physiology is helping biologists, physiologists, and biochemists continue tune of the large literature within the box. offering complete, built-in studies and sound, serious, and provocative summaries, this sequence is a must for all lively researchers in environmental and comparative body structure. mobile quantity and osmolality in animals is a good studied subject and this particular quantity within the sequence offers the reader with a radical grounding during this quarter of body structure. which include components, the textual content discusses osmolality and quantity keep an eye on by way of either inorganic and natural ions which consequently supplies a very good review to these operating and drawn to this field.

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Extra info for Advances in Comparative and Environmental Physiology: Volume and Osmolality Control in Animal Cells

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Cell swelling after ouabain requires chloride uptake as well as net gain of diffusible cations. , Cox et al. 1980) would require increased chloride and would necessitate uptake of cation and water by the cells. But many epithelial cells contain more chloride than predicted for an equilibrium distribution, indicating that secondary active transport processes determine cell chloride. One candidate is the Na-K-2Cl co-transporter. Calculations show that a simple one-for-one exchange of cell potassium for sodium would have little effect on the net driving force for such a co-transporter until the cell sodium concentration had increased markedly (Macknight 1988).

Nature (London) 319:670-672 Volume Regulation in Epithelia 39 Hopfer U, Liedtke CM (1987) Proton and bicarbonate transport mechanisms in the intestine. Annu Rev Physiol 49:51-67 Hughes PM, Macknight ADC (1976) The regulation of cell volume in renal cortical slices incubated in hyposmotic medium. I PhysioI257:137-154 Hunter M, Kawahara K, Giebisch G (1988) Calcium-activated epithelial potassium channels. Min Electr Metab 14:48-57 Kamiski LP, Aronson PS (1985) Chloride formate exchange with formic acid recycling: a mechanism of active chloride transport across epithelial membranes.

C. 2 Secretory Epithelia A different situation confronts chloride-secreting epithelia from that which absorptive epithelia face. Figure 4, based on data obtained in a number of such epithelia (Frizzell et al. 1979; Welsh 1987) summarizes the ion pathways involved. There are few studies of cell volume in stimulated secretory epithelia. In salivary gland acinar cells, the initial effect of stimulation by carbachol was a decrease in cell volume of some 15% (Foskett and Melvin 1989). This decrease is thought to reflect losses of chloride across the apical membrane and of cation, presumably potassium, across the basolateral membrane, both movements occurring through Ca-activated membrane conductances.

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Advances in Comparative and Environmental Physiology: Volume and Osmolality Control in Animal Cells by A. D. C. Macknight (auth.), Professor Dr. R. Gilles, Dr. E. K. Hoffmann, Dr. L. Bolis (eds.)


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