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Dehydrated dogs inhibit secretion of vasopressin (VP) within minutes after drinking water, before plasma osmolality (pOsm) diminishes. In recent studies, we found that water ingestion by rats similarly inhibits VP and oxytocin (OT) secretion rapidly, before pOsm is diluted. Adult male rats were infused with 1 M NaCl (2 ml/h iv) for 240 min to stimulate VP and OT secretion. After 220 min of infusion,...
Rats have two prominent responses to dehydration: secretion of the antidiuretic hormone, vasopressin (VP), and thirst. Many signals directly affect both responses. These include two excitatory signals associated with increased plasma osmolality (pOsm) and two inhibitory signals associated with decreased pOsm (one each from cerebral and visceral osmoreceptors). In addition, both VP secretion and thirst...
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