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Science 29 January 1971:
Vol. 171. no. 3969, pp. 413 - 415
DOI: 10.1126/science.171.3969.413
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Articles

Sodium and Potassium Activities in Normal and "Sodium-Rich" Frog Skeletal Muscle

W. McD. Armstrong 1 and Chin O. Lee 1

1 Department of Physiology, Indiana University School of Medicine, Indianapolis 46202

In frog sartorius muscles immersed for 2 hours at 26°C in normal Ringer solution, the intrafiber potassium concentration, CK(in millimoles per liter), was 123 ± 2 (mean value plus or minus standard error), and the potassium activity, aK (in millimoles per liter), was 90 ± 1.0. The corresponding sodium concentration and activity were 20 ± 1 and 6.5 ± 0.4, respectively. After overnight immersion in K+-free Ringer solution the values were: CK, 97 ± 2; aK, 81.5 ± 1.6; CNa, 47 ± 2; and aNa, 11.2 ± 0.6. The changes in aK and aNa during storage were not consistent with an exchange between predominantly "free" fiber K+ and external Na+. These results suggest that the Na+ taken up during overnight immersion largely replaced adsorbed or sequestered K+ in the fibers.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Intracellular Ionic Activity Measured in Different Tissues.
M. M. Civan (1980)
JPEN J Parenter Enteral Nutr 4, 131-136
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Potassium accumulation frog muscle: the association-induction hypothesis versus the membrane theory.
J. GULATI and L. G. PALMER (1977)
Science 198, 1283-1284
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Activities of Sodium and Potassium Ions in Epithelial Cells of Small Intestine.
C. O. Lee and W. McD. Armstrong (1972)
Science 175, 1261-1264
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