Circannual renal function and plasma electrolytes of the marmot [Fonction rénale circannuelle et électrolytes plasmatiques de la marmotte].

Résumé

Étude chez M. flaviventris des rythmes circannuels de débit plasmatique rénal effectif, ainsi que de l'osmolarité et des teneurs en sodium et potassium du plasma. Studies with unanesthetized active (nonlethargic) marmots demonstrated circannual rhythms of renal function (clearances of p-aminohippurate, creatinine and inulin), plasma osmolality, and plasma sodium and potassium concentrations. Effective renal plasma flow, glomerular filtration rate, the clearance of creatinine, and plasma potassium were highest in spring and lowest in the fall and winter. Plasma osmolarity and plasma sodium concentrations tended to be highest during the winter months and lowest in the spring and summer, p-Aminohippurate excretion was shown to be Tm-limited system.