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The Journal of General Physiology, Vol 34, 411-429, Copyright © 1951 by The Rockefeller University Press

ARTICLE

CATION EXCHANGE BETWEEN CELLS AND PLASMA OF MAMMALIAN BLOOD

II. SODIUM AND POTASSIUM EXCHANGE IN THE SHEEP, DOG, COW, AND MAN AND THE EFFECT OF VARYING THE PLASMA POTASSIUM CONCENTRATION



C. W. Sheppard 1, W. R. Martin 1, and Gertrude Beyl 1

1 From the Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee

Sodium and potassium exchange has been studied in the blood of the sheep, dog, cow, and man. The potassium exchange rate in human cells is practically unaltered by increasing the plasma potassium concentration approximately threefold. Comparing the results in different species the exchange rate for potassium shows a rough correlation with the intracellular amount of the element. Expressed in per cent of the cellular content sodium tends to exchange more rapidly than potassium. In three instances the specific activity curves deviate from the simple exponential behavior of a two compartment system. In the exchange of potassium in canine blood the deviation is caused by the presence of a rapidly exchanging fraction in the buffy coat cells. Such an effect does not account for the inhomogeneity of sodium exchange in human blood.

Submitted on August 2, 1950


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