[Localization of Ca2+ in the smooth muscle and glandular cells of the rabbit uterus].

The pyroantimonate and radiometric procedures were used to establish the presence of three foci of selective accumulation of ions Ca2+ in the myometrium smooth-muscular cells: in nuclei, mitochondria and endoplasmatic reticulum. In the epithelium of the womb glands, besides the same foci a considerable amount of ions Ca2+ is contained in the cytoplasm matrix. Under the effect of serotonin the myometrium nuclei lose 45Ca most actively in the epithelium cells of the womb glands the content of Ca2+ changes, that gives reason to suppose that these structure participate in the calcium redistribution with a change in the functional activity of myometrium.