The Distribution of Calcium and Magnesium between the Cells and the Extracellular Fluids of Skeletal Muscle and Liver in Dogs
نویسندگان
چکیده
Although the distribution of sodium, potassium, and chloride in mammalian tissue is now well established, this cannot be said for calcium and magnesium. From analyses of whole tissues for these elements it may be inferred that the magnesium content of the cells, like that of potassium, is relatively high, while calcium must be present in cells in considerably lower concentration than is magnesium, and ma.y, like sodium, be chiefly a constituent of the extracellular fluids. The latter inference has been supported by the direct analyses of Tilyone muscle by Steinbach (I), who found that calcium is present in the cells of this tissue in lower concentration than in the surrounding medium. Scott (2) and Scott and Packer (3) have found by use of the electron microscope that the sum of magnesium and calcium in the cells of striated and of smooth muscle is much greater than in the intercellular spaces, but their work gives no clue as to the distribution of magnesium and calcium individually and their observations are quite compatible with a marked difference in the distribution of these two elements. This paper presents the results of applying principles now accepted as criteria for the distribution of sodium and potassium to determinations of the distribution of magnesium and calcium in the liver and skeletal muscle of dogs. Data for sodium and potassium are also included.
منابع مشابه
The Distribution of Calcium and Magnesium between the Cells and the Extracellular Fluids of Skeletal Muscle and Liver in Dogs
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