Before birth the ductus arteriosus carries blood from the _______ to the ______ thereby bypassing the _________.

Question

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Before birth, the ductus arteriosus carries blood from the pulmonary trunk to the aorta, thereby bypassing the lungs. This is necessary because the lungs are not yet functional in utero and the fetus receives oxygen from the placenta instead. After birth, the ductus arteriosus should close off and redirect blood flow to the lungs for oxygenation.

Before Birth the Ductus Arteriosus Carries Blood from the _______