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  • Title: Potassium reabsorption and secretion in the perfused bullfrog kidney.
    Author: Deeds DG, Sullivan LP, Welling DJ.
    Journal: Am J Physiol; 1978 Jul; 235(1):F26-32. PubMed ID: 307915.
    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.
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