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The placenta is the container that keeps the baby isolated from the mother. The fetal blood flows through the baby, out the umbilical cord to the placenta and no further. The placental membrane separates maternal blood from fetal blood.Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries.he fetal blood flows through the baby, out the umbilical cord to the placenta and no further. The placental membrane separates maternal blood from fetal blood. Oxygen and nutrients in the maternal blood in the intervillous spaces diffuse through the walls of the villi and enter the fetal capillaries.
Waste products from the fetal blood are transferred back across the placenta to the mother's blood. Inside the fetal heart: Blood enters the right atrium, the chamber on the upper right side of the heart. When the blood enters the right atrium, most of it flows through the foramen ovale into the left atrium.t moves blood from the right atrium of the heart to the left atrium. The ductus arteriosus moves blood from the pulmonary artery to the aorta. Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus.