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общая лексика
свободная центральная плацентация
[plæsən'teiʃ(ə)n]
общая лексика
плацентация
образование плаценты
тип строения плаценты
медицина
прикрепление плаценты
Смотрите также
существительное
биология
образование плаценты
тип
строение плаценты
зоология
плацентация
общая лексика
осевая плацентация
Placentation refers to the formation, type and structure, or arrangement of the placenta. The function of placentation is to transfer nutrients, respiratory gases, and water from maternal tissue to a growing embryo, and in some instances to remove waste from the embryo. Placentation is best known in live-bearing mammals (theria), but also occurs in some fish, reptiles, amphibians, a diversity of invertebrates, and flowering plants. In vertebrates, placentas have evolved more than 100 times independently, with the majority of these instances occurring in squamate reptiles.
The placenta can be defined as an organ formed by the sustained apposition or fusion of fetal membranes and parental tissue for physiological exchange. This definition is modified from the original Mossman (1937) definition, which constrained placentation in animals to only those instances where it occurred in the uterus.