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Fetal Circulation Model table top ph meter suppliers in hyderabad com/s/files/1/2407/1409/products/inertia-disc-labdeal-laboratorydeal-circle_941Fetal Circulation Model In the placenta the blood becomes enriched with nutrients and oxygen and gets via the unpaired umbilical vein into the fetal blood circulation system. During pregnancy, the fetal circulatory system works differently than after birth.