Eustachian valve in fetal circulation directs blood flow from the inferior vena cava to the left atrium via which structure?

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Multiple Choice

Eustachian valve in fetal circulation directs blood flow from the inferior vena cava to the left atrium via which structure?

Explanation:
In fetal circulation the Eustachian valve at the opening of the inferior vena cava helps direct oxygen-rich blood toward the foramen ovale, an opening in the interatrial septum. Blood passes through the foramen ovale into the left atrium, then to the left ventricle and onward to the aorta, effectively bypassing the nonfunctioning fetal lungs. After birth, the foramen ovale typically closes as the lungs take over oxygenation.

In fetal circulation the Eustachian valve at the opening of the inferior vena cava helps direct oxygen-rich blood toward the foramen ovale, an opening in the interatrial septum. Blood passes through the foramen ovale into the left atrium, then to the left ventricle and onward to the aorta, effectively bypassing the nonfunctioning fetal lungs. After birth, the foramen ovale typically closes as the lungs take over oxygenation.

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