By E. Feldman, R. Nelson

ISBN-10: 0721693156

ISBN-13: 9780721693156

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Sample text

Thirst mechanisms also involve interactions between extracellular fluid volume and osmolality. During periods of dehydration, increased plasma osmolality provides approximately 70% of the increased thirst drive, and the remaining 30% is due to hypovolemia. In salt depletion, the situation is less clear, but the normal drinking behavior or increased drinking observed in experimental animals has been attributed to the associated hypovolemia (Ramsay, 1983). Miscellaneous Factors. A variety of nonosmotic and nonhemodynamic factors may also stimulate AVP secretion.

Hypovolemia stimulates renin secretion, which promotes angiotensin formation. The relative roles of the direct baroreceptor input versus angiotensin mechanisms in the thirst response to extracellular dehydration have yet to be determined. Interaction of Plasma Osmolality and Blood Volume. Normal day-to-day regulation of water balance involves interaction between osmotic and volume stimuli. In the case of vasopressin secretion, decreases in extracellular fluid volume sensitize the release of vasopressin to a given osmotic stimulus.

These disorders resemble primary NDI but are referred to as acquired or secondary, because AVP, AVP receptor sites, and postreceptor mechanisms responsible for water absorption are present. PYOMETRA. Bacterial endotoxins, especially those associated with Escherichia coli, can compete with AVP for its binding sites on the renal tubular membrane, causing a potentially reversible renal tubular insensitivity to AVP. The kidneys have an impaired ability to concentrate urine and conserve water, and polyuria with compensatory polydipsia develops.

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Canine and Feline Endocrinology and Reproduction by E. Feldman, R. Nelson

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