Abstract
Effects of alterations in potassium concentrations on net fluid absorption (J<sub>v</sub>) by isolated, perfused snake <i>(Thamnophis </i>spp.) proximal renal tubules were studied. With standard (3 mmol/l potassium, 150 mmol/l sodium) Ringer’s solution in perfusate and bath, J<sub>v</sub> was about 1.3 nl min<sup>-1</sup> mm<sup>-1</sup>. Replacing potassium with sodium in perfusate or in both perfusate and bath had no significant effect on J<sub>v</sub>. Increasing potassium concentration to 100 mmol/l in place of sodium in perfusate or in both perfusate and bath also had no effect on J<sub>v</sub>. Findings that potassium is not critical for maintaining J<sub>v</sub> are also consistent with previous findings that sodium is not necessary for maintaining J<sub>v</sub>.
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