Answer:
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.
