Question

fill in the blank question
the increased pressure on the left side of the heart resulting from a newborns first breath causes the two flaps of the interatrial septum to close off the oval e.
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Explanation:

In a newborn, the first breath changes the pressure - balance in the heart. The foramen ovale is a normal opening in the interatrial septum in the fetal heart. When the left - side heart pressure increases due to the first breath, the two flaps of the interatrial septum close off the foramen ovale.

Answer:

foramen