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Sagot :
Regarding respiratory changes at birth, changes in blood flow that occur lead to the closure of the foramen ovale the embryonic interatrial connection.
A patent foramen ovale (PFO) is a hole in the heart's left and right atria (upper chambers). This hole exists in everyone before birth, but most often closes shortly after being born. When a hole fails to close naturally after a baby is born, it is referred to as a PFO.
During foetal development, the foramen ovale is an opening in the muscular tissue between the left and right atrium that allows blood to cross the atria and bypass the pulmonary circulation.
To know more about foramen ovale here
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