Solved UPSC CDS/OTA Question
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Q · Circulatory Systemmedium · 45s
The ductus arteriosus in fetal circulation shunts blood between:
TopicCirculatory System
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
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The ductus arteriosus bypasses nonfunctional fetal lungs by connecting the pulmonary artery to the descending aorta. It normally closes after birth due to increased oxygen tension and decreased prostaglandins.
Final Answer: Option A - Pulmonary artery and aorta