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The present author (Noda, 1968) has reported that the difference in resting metabolism results in the difference in responsive 22Na efflux which has been produced by either withdrawal of external K ions or application of ouabain, in the nervous tissue, and the effect of the former is distinguishable from that of the latter in spite of the presence of the same effect on Na efflux from the excitable cells. The experiments have been attempted to clarify this discrepancy in further detail in the frog sartorius muscles, standing on the basis that metabolism in the plasma membrane can be separated from that in the cytoplasm and the most metabolism-dependent phenomenon among various membrane phenomena is an active efflux of Na ions. The chemical organization of the membrane is composed of fixed constituents and mobile parts, and this paper is concerned mainly with the change in properties of the latter component. Although ouabain and withdrawal of external K ions are known to influence on Na of flux similarly, attempts to discriminate effects of ouabain from K free effect on 22Na efflux have been made by supposing different changes in transport ATPase system. The changes in ion contents of the muscle or in 45Ca dissociation have been parallelly investigated. In other words, the difference in effects between ouabain and external K removal, apparently similar but essentially different, has been explained by the difference in participation of each experimental condition in the operation of ATPase system locating in the membrane, and it has been presumed that the effects of the two on Na of flux are not interpreted by a simple competition on the same sites of the transport system in the membrane.

THE EFFECTS OF OUABAIN AND NO EXTERNAL K IONS ON ACTIVE TRANSPORT OF Na IONS FROM THE FROG MUSCLE