Potassium and Sodium in Frog Muscle

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Science  09 Jun 1972:
Vol. 176, Issue 4039, pp. 1139-1141
DOI: 10.1126/science.176.4039.1139


Sodium-rich frog muscles are found to extrude sodium and reaccumulate potassium at 0°C. The uptake of potassium by these muscles is studied at three different temperatures as a function of external potassium concentration, Kex. The steady-state potassium content of the tissue is related to Kex. by a sigmoidal cooperative curve at all temperatures. These results are compared with findings on a mammalian smooth muscle.

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