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From what I understand in the Goljan audio, the pulmonary artery mostly contains deoxygenated blood from the superior vena cava because the oxygenated blood from the umbilical vein through the inferior vena cava goes straight across the foramen ovale into the left atrium, and the blood from the SVC goes straight into pulmonary artery. But according to a question in mini-Qbook, the purpose of the ductus arteriosus is to shunt oxygenated blood from the pulmonary artery into the aorta. Which is it, or am I misunderstanding Goljan?