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

Advances in Compararative and Environmental Physiology is helping biologists, physiologists, and biochemists hold music of the wide literature within the box. delivering finished, built-in reports and sound, serious, and provocative summaries, this sequence is a must for all energetic 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 presents the reader with an intensive grounding during this quarter of body structure. which includes components, the textual content discusses osmolality and quantity keep an eye on by way of either inorganic and natural ions which for this reason provides a superb evaluation to these operating and drawn to this field.

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

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Proc Natl Acad Sci USA 82:6362-6365 Kirk KL, Schafer lA, DiBona DR (1987a) Cell volume regulation in rabbit proximal straight tubule perfused in vitro. Am I Physiol 252:F922-F932 Kirk KL, DiBona DR, Schafer IA (1987b) Regulatory volume decrease in perfused proximal nephron: evidence for a dumping of cell K+. Am I PhysioI252:F933-F942 Kleinzeller A (1965) The volume regulation in some animal cells. Arch Bioi Liege 76:217-232 Larson M, Spring KR (1987) Volume regulation in epithelia. Curr Top Membrane Transp 30:105:123 Lau K, Hudson RL, Schultz SG (1984) Cell swelling increases a barium-inhibitable energy dependent potassium conductance in the basolateral membrane of Necturus small intestine.

Unlike tight epithelia, gallbladder epithelial cells possess a range of transporters at both the apical and basolateral membranes and combinations of these contribute to volume regulation under different conditions. There is still debate about the relative importance and activities of the various transporters. For example, Reuss and his collaborators have adduced evidence for an important role for apical membrane Na-H and CI-HC03 exchangers under isosmotic conditions (reviewed by Reuss and Stoddard 1987; Reuss 1989).

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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