Potassium ion: is the bulk of intracellular K+ adsorbed?
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.
D000818:Animals; D001001:Anura; D009682:Magnetic Resonance Spectroscopy; D008566:Membranes / Q000378:metabolism; D009132:Muscles / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012964:Sodium / Q000378:metabolism
D012964:Sodium; D011188:Potassium