CESIUM-SODIUM INTERACTIONS ON X-RAY DEPOLARIZATION OF MUSCLE FIBERS
EMORY UNIV ATLANTA GA
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Cesium ions in bathing fluid produce a depolarization of frog sartorius muscle fibers independent of the depolarization produced by irradiation. The fractional depolarization produced by x-rays is independent of external cesium concentration, but proportional to external sodium concentration, and is explained as the result of an increased sodium ion permeability. Cesium depolarization 20mMCs in non-irradiated fibers increases with decreasing sodium concentration, indicating a specific sodium-cesium interaction in the membrane. A simple concentration-cell potential explanation for the cesium effects is not yet adequate.
- Anatomy and Physiology