In fetal circulation, if the foramen ovale fails to close after birth, allowing backflow, blood will flow from the:

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ARight atrium to the left atrium
BLeft ventricle to the right ventricle
CRight ventricle to the left ventricle
DLeft atrium to the right atrium

✓ Correct answer: D. Left atrium to the right atrium In fetal circulation, the foramen ovale allows blood to bypass the non-functional fetal lungs by moving blood directly from the right atrium to the left atrium. After birth, this opening usually closes. If it fails to close, blood from the higher pressure left atrium can flow back into the lower pressure right atrium after birth.

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In fetal circulation, if the foramen ovale fails to close after birth, allowing backflow, blood will flow from the:

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