[Chief types of placental trophism].
An attempt is made to represent a theory on two types of placental throphism. The first type--nutrition is mainly performed at the expense of maternal proteins, which in the placental chorion undergo proteolysis with formation of polypeptides and amino acids; embryospecific proteins are formed in the liver of the embryo. This type is characteristic for the animals with epithelio-chorionic acid and partly with desmo-chorionic placentas. The second type is characterized by resorption of amino acids from the maternal organism, from the latter embryospecific proteins are synthesized in the chorion. Thus, placental nutrition is specific for man and animals with hemochorionic and, partly, with endothelio-chorionic placentas.
D000596:Amino Acids / Q000378:metabolism; D000818:Animals; D005075:Biological Evolution; D005260:Female; D006651:Histocytochemistry; D006801:Humans; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000033:anatomy & histology / Q000378:metabolism / Q000502:physiology*; D010929:Placentation; D011247:Pregnancy; D011506:Proteins / Q000378:metabolism; D011817:Rabbits; D051381:Rats; D014327:Trophoblasts / Q000378:metabolism
D000596:Amino Acids; D011506:Proteins
Osnovnye tipy platsentarnoĭ trofiki.