Tissue buffering in rat diaphragm

Excised rat diaphragm muscles were incubated in nutrient media at various hydrogen ion concentrations. Those in the more acid media lost more potassium and more sodium than their controls at ph 7.4, and the extent of the loss was increased by further depression of the ph. The potassium loss was unaccompanied by either chloride or phosphate, nor was there any difference in the weight change or inulin space between the control and experimental muscles. These results are consistent with the theory that intracellular cation exchanges for excess extracellular hydrogen ion.

Some effects of phenolic anti-oxidants on sodium and potassium balance in the rabbit

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Pathophysiology of rheumatic fever: alterations in the Na24 space and in the exchangeable sodium and potassium contents

Radioisotopic technics were used to explore physiologic aberrations that may characterize individuals with acute rheumatic fever. No significant changes were noted in serial measurements of the blood volume or serum sodium and potassium concentrations. Most of the individuals with severe disease showed an initial value for radiosodium space of more than 330 ml./Kg. of body weight, with no evidence of edema. The exchangeable sodium content of the body correlated well with the radiosodium space. These changes are difficult to explain solely on the basis of extracellular edema, and are interpreted as suggesting that the intracellular content of sodium or that in bone is increased during acute rheumatic fever. An intracellular increase in sodium may be due to an alteration in the permeability of cell membrane induced by an immune mechanism.

Influence of digitoxin on labile and inorganic phosphates, lactate, glycogen, potassium and sodium in dog ventricle

This communication deals with the effects produced by digitoxin on the metabolism of the dog's ventricles as indicated by changes in labile and inorganic phosphates, lactate, glycogen, potassium and sodium content of the myocardium immediately frozen after excision. The results suggest increased turnover of high energy phosphate and glycogen by nontoxic doses.