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Sagot :
In a fetus, the ductus arteriosus is the fetal connection between the pulmonary trunk and the aorta.
The ductus arteriosus is a normal blood vessel that forms a connection between two main arteries i.e. the aorta and the pulmonary artery which carries blood away from the heart. The lungs are not active while a fetus is in the womb as the baby receives oxygen directly from the mother's placenta.
The fetal lungs are filled with amniotic fluid hence, they cannot be used to oxygenate the blood. Also, the arterioles in the lungs are constricted, which limits the amount of blood that can pass through the pulmonary system.
As the fetal blood leaving the placenta is already rich in oxygen and the lungs are non-functional, thereby, the ductus arteriosus permits a part of this blood to detour the pulmonary circulation to enter directly into the systemic circulation.
To learn more about ductus arteriosus here
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