... mediated by Rhesus glycoproteins. Ammonia secretion is largely independent of sodium counter-transport. Renal excretion Renal tubule Urine pH Urine flow rate Glomerular filtration rate Amino acid catabolism Rhesus glycoproteins Na + transport Acid­–base regulation Under normal...

... for extracellular fluid volume, glomerular filtration rate and drinking rate. Tests (8 h) on resting freshwater trout showed that when measuring [ 3 H]PEG-4000 clearance from the plasma in the efflux direction, correction for a large excretion via glomerular filtration was essential, necessitating urinary...

... of the paracellular marker [ 3 H]PEG-4000 during hypoxia and normoxic recovery. At the kidney, glomerular filtration rate, urine flow rate, and tubular Na + reabsorption rate fell in parallel by 70% during hypoxia, facilitating additional reductions in costs and in urinary Na + , K + and ammonia excretion rates...

... of the kidney in the resolution of this osmoregulatory dilemma. Broad-tailed hummingbirds( Selasphorus platycercus ) displayed diurnal variation in glomerular filtration rate (GFR). During the morning, midday and evening, GFRs were 0.9±0.6, 1.8±0.4 and 2.3±0.5 ml h –1 ,respectively. At midday, GFR increased...

... in the gastrointestinal tract of Palestine sunbirds ( Nectarinia osea )decreases with increasing water ingestion rate, we predicted that glomerular filtration rate (GFR) in these birds would not be unusually high in spite of large ingested water loads. When feeding on dilute sucrose solutions, sunbirds ingested between 4...

... physiological systems in mammals. Aside from its role in tubular resorption of water, VP has also been implicated in elevating glomerular filtration rate (GFR) in rats( Bouby et al., 1996 ; Roald et al., 2000 ) and Na + excretion in dogs ( Bie et al., 1984 ; Buckalew and Dimond,1976 ; Chan and Sawyer,1961...

... 10 1998 © The Company of Biologists Limited 1998 myxinoid kidney Eptatretus stouti perfused glomerulus fluid dynamics glomerular filtration rate glomerular-capillary pressure The structure of the hagfish mesonephros is the simplest of any known vertebrate: it consists...