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What changes are observed in the uterus subsequent to implantation of young embryo?

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Ruptured graafian follicle transforms into corpus luteum which secrets progesterone which is necessary for thickening of endometrium. Disc like structure is formed by interdigitation of maternal tissue and embryonal tissue which is referred as placenta.
Placenta serves to provide nutrients and oxygen from mother's blood to embryo and also removes waste generated by embryo. The embryo and placenta are connected by umbilical cord.

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