Potassium Ion: Is the Bulk of Intracellular K + Adsorbed?

Abstract
When a major portion of the intracellular K + in frog muscle is reversibly replaced by Na + , the extra Na + gained by the cells does not show the nuclear magnetic resonance signal that free Na + does. The data contradict the membrane theory but are in accord with the concept that the bulk of intracellular K + is adsorbed.

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