[Mechanisms of regulation of Ca2+ levels in myometrium cells].

The ways and mechanisms of the Ca2+ concentration regulation in myometrium cells are analyzed. The plasma membrane is thoroughly studied for its role in the calcium control provision for the contractile activity of the uterus. The systems of Mg2+-ATP-dependent transport of Ca2+, sodium-calcium metabolism as well as regularities of the Ca2+ passive transfer in the sarcolemma vesicles are considered. The systems of the Mg2+-ATP- and N+-dependent transport of calcium are discussed for their contribution into regulation of calcium concentration in the myoplasm. Oxytocin and ions of bivalent metals (stimulators of the contractile activity of the uterus) are studied for their effect on the activity of the sarcolemma calcium pump.