In fetal circulation,one way in which blood bypasses the nonfunctional lungs is by way of the foramen ovale.

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The foramen ovale is a membranous opening between the right and left atria in the fetal heart. It allows oxygenated blood from the placenta to bypass the nonfunctional lungs and enter the left atrium, where it is then distributed to the rest of the body. Once the baby is born and takes its first breath, the foramen ovale typically closes and blood flows through the lungs as the oxygenation site.

In Fetal Circulation,one Way in Which Blood Bypasses the Nonfunctional