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Fetal Circulation How does the fetal circulatory system work? During pregnancy, the fetal circulatory system works differently than after birth: The fetus is connected by the umbilical cord to the placenta. This is the organ that develops and implants in . Most of the circulation to the lower body is supplied by blood passing through the ductus arteriosus. This blood then enters the umbilical arteries and flows into the placenta. In the placenta, carbon dioxide and waste products are released into the mother's circulatory system, and oxygen and nutrients from the mother's blood are released into.

At birth, major changes take place. The umbilical cord is clamped and the baby no longer receives oxygen and nutrients from the mother. With the first breaths of air, the lungs start to expand, and the ductus arteriosus and the foramen ovale both close. The baby's circulation and blood flow through the heart now function like an adult's. Aug 19,  · The circulatory system is a major organ system of the body. This system transports oxygen and nutrients in the blood to all of the cells in the body. In addition to transporting nutrients, the circulatory system also picks up waste products generated by metabolic processes and delivers them to other organs for disposal.

Aug 4, - Understanding the fetal circulation helps to understand how some forms of congenital heart disease occur. Before birth: fetal lungs are collapsed & oxygen is provided by placental circulation. After birth: newborn breathes air, lungs expand & pulmonary circulation provide oxygen. Congenital cardiovascular problems develop if proper circulatory changes do 36 pins. The fetal circulation (Fig. 1) is markedly different from the adult circulation. In the fetus, gas exchange does not occur in the lungs but in the placenta. The placenta must therefore receive deoxygenated blood from the fetal systemic organs and return its oxygen rich venous drainage to the fetal systemic arterial circulation.