After circulating there, the blood returns to the right atrium of the heart through the superior and inferior vena cava. From the aorta, oxygenated blood is sent to the body.It then goes to the aorta (the large artery coming from the heart). Blood then passes into the left ventricle (lower chamber of the heart).Most of the blood flows to the left side through a special fetal opening between the left and right atria. Blood enters the right atrium (the chamber on the upper right side of the heart).The blood then reaches the inferior vena cava, a major vein linked to the heart. It goes to the liver and splits into three branches. Waste products and carbon dioxide from the fetus are sent back through the umbilical cord and placenta to the mother's circulation to be removed.īlood from the mother enters the fetus through the vein in the umbilical cord.This comes from the mother through the placenta. The fetus gets all the needed nutrition, oxygen and life support through the blood vessels in the umbilical cord.The placenta is the organ that develops and implants in the mother's uterus when she is pregnant. The fetus is linked to the placenta by the umbilical cord.During pregnancy, the fetal circulatory system works in a different way than after birth:
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