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Soon after implementation , uterine walls thickens and a special placenta is formed . this is a disc embedded in the uterine wall.it contains villi on the embryo side of the tissue. on mother's side are blood spaces which surround villi. this provides a large surface area for glucose and oxygen to pass from the mother to embryo. the waste products generated by the embryo also get removed as they are transfered into mother's blood.
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