Abstract
The article analyzes the importance of estrogen during pregnancy. The mechanism of hormones effects is summarized. The effect of estrogen on utero-placental blood flow, its necessity to run tissue morphogenesis in placenta and uterus, the impact on other steroid and protein hormones production, stimulating effect on 11β-hydroxysteroid dehydrogenase work, regulation of LDL expression are studied. The growth factors that are mediators of estrogen are shown. There was made a conclusion that in early pregnancy estrogens contribute to morphological and functional growth, development and differentiation of placenta and in the second half of pregnancy estrogens stimulate functional maturation. Furthermore, hormones play an important role in the development of lung, kidney, liver, ovarian follicles, fetal bone and promote the formation of different changes in the mother necessary for the maintenance of pregnancy.
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