Drinking and renal responses to peripherally administered osmotic stimuli in the pigeon (Columbia livia).

摘要: Pigeons drank copiously in response to intravenous (I.V.) infusion of approximately equi-osmolar hypertonic solutions NaCl (0.5 M), sucrose (1.0 M) or mannitol M). I.V. infusions glucose urea were less effective causing drinking. The calculated percentage change plasma osmolality at the onset drinking was similar for three solutions, NaCl, and mannitol, irrespective concentration solution infused. A greater volume water drunk 7 ml 1.0 M-sucrose than a M-NaCl mannitol. This appeared be large diuresis caused by infusions. Excretion osmotic load more rapid following 10 h experiment. In anaesthetized pigeons, increases osmolality. haematocrit significantly reduced after but not urea. Plasma Na+ increased decreased sucrose, whereas produced little change. Following urea, cerebrospinal fluid (c.s.f.) its flow compared with isotonic Hypertonic stopped c.s.f. almost completely during course These experiments suggest that renal responses pigeons stimuli are those mammals they appear retain Na+.