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[Calcium ion currents in the smooth muscle of the myometrium].

The results of kinetic analysis of Ca liberation from preparations of female rabbit myometrium show that in the uterus smooth muscle there exist three pools of cation with characteristic times of metabolism 182.18 +/- 25.20, 25.56 +/- 1.00 and 2.94 +/- 0.38 min respectively. It was concluded from the compartmentalization analysis and from the data on Na+- and Mg2+--ATP-dependent transport in plasmic membrane fraction of myometrium cells that the fast phase of calcium metabolism reflects the liberation of the cation from extracellular space in the incubation medium, the intermediate one--Ca transfer from myocytes into the extracellular medium, and the slow one--liberation from the subcellular structures into the myoplasm.