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Anatomy Pharyngeal arch and its derivatives, pharyngeal arch aeries 75361554

The structure marked A begins to close by what time frame and due to what cause?

A
Begins to close at 10-15 hours after bih, due to withdrawal of prostaglandins
B
Begins to close at 10-15 hours after bih, due to expression of prostaglandins
C
Begins to close 4 weeks after bih, due to fall in oxygen concentration
D
Begins to close 4 weeks after bih, due to rise in oxygen tension
High-Yield Explanation
The structure marked is ductus aeriosus which begins to close 10-15 hours after bih due to withdrawal of prostaglandins and exhibits functional closure by 7 days and anatomical closure by 4 weeks after bih.
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