A patent ductus arteriosus permits .

-the deoxygenated blood pumped out by the left ventricle to quickly flow into the pulmonary trunk
-blood to flow from the aorta into the pulmonary trunk
-blood to enter the pulmonary trunk from the aorta because the higher blood pressure in the pulmonary trunk forces blood to flow into the pulmonary trunk
-All of the listed responses are correct.

A patent ductus arteriosus permits blood to flow from the aorta into the pulmonary trunk

Explanation:

Ductus arteriosus is an important part of foetal ciculation and acts as a shunt between pulmonary trunk and aorta allowing the deoxygenated blood to bypass the lungs and aorta. It normal fuses at birth ( 72 hours after birth)

If the ductus arteriosus fails to collapse at birth, a patent vascular channels forms connecting the pulmonary trunk an aorta shunting the blood from left to right allowing the oxygenated blood to pass back through the blood vessels in lungs.

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