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Am J Physiol 205: 873-877, 1963;
0002-9513/63 $5.00
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Effect of potassium on secretion and potential of frog's gastric mucosa in Cl–-free solutions

T. L. Davis 1, J. R. Rutledge 1, and W. S. Rehm 1

1 Department of Physiology, University of Louisville School of Medicine, Louisville, Kentucky

In previous work it was shown that the potential difference of the secreting mucosa bathed in Cl–-free solutions (SO4– replacing Cl–) is negative (nutrient side negative). In the present work it was found that an increase of the K+ concentration (K+ substituted for Na+) of the bathing fluid on the secretory side produced an increase in H+ secretory rate. The effect of voltage-clamping at zero and at +100 mv on the H+ rate, with various K+ concentrations in the bathing fluids, yielded results predicted by the electrogenic H+ theory, but not by a forced exchange concept.

Key Words: resistance and potassium • resistance, frog's stomach • resistance, electrical • electrogenic H+ mechanism • short-circuiting on gastric HCl • stomach • voltage-clamping on stomach

Submitted on February 25, 1963






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