title: Potassium reabsorption and secretion in the perfused bullfrog kidney.
abstract: Techniques have been developed for obtaining comparative estimates of the rates of K secretion and reabsorption in the artificially perfused bullfrog kidney and the use of 42K infused into the portal circulation. In control experiments in which Kexc/Kfilt averaged 0.65, approximately 30% of filtered K escaped reabsorption and excreted K was composed of roughly equal parts of filtered K and secreted K. Fractional reabsorption of K was constant at 70% over a wide range of filtration rates. The rate of K secretion correlated significantly with the rate of Na reabsorption and with the urine flow rate. Acetazolamide stimulated secretion and inhibited reabsorption.
mesh_terms: D000086:Acetazolamide / Q000494:pharmacology*; D000818:Animals; D001001:Anura; D001692:Biological Transport; D005919:Glomerular Filtration Rate; D007668:Kidney / Q000378:metabolism*; D008297:Male; D010477:Perfusion; D011188:Potassium / Q000378:metabolism*; D011892:Rana catesbeiana; D012964:Sodium / Q000502:physiology
chemical_list: D012964:Sodium; D000086:Acetazolamide; D011188:Potassium