Before birth, the baby has an oval opening between the atria, which closes after the baby is born. Explain what is its biological meaning?

The embryo lacks a small circle of blood circulation, since there is no pulmonary respiration yet; the mother’s blood is filtered by the infant’s liver and enters its blood vessels, so communication between the right and left sides of the heart is justified. After birth, the baby begins to breathe on its own, the oval opening closes.

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