FETAL CARDIOLOGY

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Descending aorta Fetal deoxygenated blood returning from the superior vena cava and lower extremities is directed toward the right ventricle and pulmonary trunk. The majority of this blood flow passes through the ductus arteriosus, into the descending aorta, and perfuses the lower extremities and hypogastric arteries. Deoxygenated fetal blood returns to the placenta via two umbilical arteries. Therefore Descending Aorta is correct answer
Ductus arteriosus it allows the blood to bypass non functioning lungs and return to placenta via descending aorta and umbillical arteries
Ductus Arteriosus
Descending aorta
through the Ductus arteriosus into the descending aorta to the umbilical arteries.

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