In fetal circulation, blood may bypass the pulmonary circuit by passing from the pulmonary trunk to the aorta through the

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The ductus arteriosus is a temporary blood vessel that connects the pulmonary trunk to the aorta in fetus. This allows blood to bypass the lungs, which are not yet functional, and go directly to the body. After birth, the ductus arteriosus usually closes within the first few hours to days of life.

In Fetal Circulation, Blood May Bypass the Pulmonary Circuit by Passing