The placenta is a disc that is embedded in the uterine wall during pregnancy. On the embryo’s side of the tissue, there are villi. The villi are surrounded by blood gaps on the mother’s side. This allows glucose and oxygen to flow from the mother to the embryo over a vast surface area. With the help of the placenta, the embryo receives sustenance from the mother’s blood. Waste products are produced by the developing embryo and can be eliminated by moving them into the mother’s bloodstream via the placenta.