5. Choice B is the incorrect answer. The ductus arteriosis connects the aorta to the pulmonary artery. It shunts the majority of blood away from the lungs by virtue of pressure gradients and high oxygen affinity by the maternal hemoglobin. The foramen ovale is an opening between the left and right atria that closes within the first 24 hours. There is a higher pressure in the right heart than the left during fetal circulation. This reverse after birth when negative pressure breathing starts and the baby starts to breath on their own.
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