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What is placenta?...

What is placenta?

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It is the structure formed by the union of the foetal and uterine tissue for purpose of nutrition, respiration and excretion of the embryo. Although the blood vessels of the embryo and the mother come close but are kept separated by some barriers between them. The useful substances pass from maternal blood to foetal blood while the wastes (excretory products and `CO_2` ) are passed from the foetal blood to maternal blood.
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