In a fetus,this structure allows blood to flow directly from the pulmonary trunk into the aorta.

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The ductus arteriosus is the structure that allows blood to flow directly from the pulmonary trunk into the aorta in a fetus. This allows for the bypass of the non-functioning fetal lungs. After birth, the ductus arteriosus typically closes within a few days to a few weeks, allowing for normal pulmonary circulation.

In a Fetus,this Structure Allows Blood to Flow Directly from the Pulmonary