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Fetal Circulation
...  suspends the fetus and, through the ductus arteriosus, the pulmonary artery and the aorta are connected. This connection directs most of the fetal blood away from the lungs. Fetal circulation changes at birth. When the fetus becomes an infant, the infant breathes for the first time and the foramen ovale and ductus arteriosus close. The blood no longer bypasses the pulmonary circulation;  ...


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