(A) The $Foramen \text{ } ovale$ is an opening in the interatrial septum of the fetal heart that allows blood to bypass the non-functional fetal lungs

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(A) The $Foramen \text{ } ovale$ is an opening in the interatrial septum of the fetal heart that allows blood to bypass the non-functional fetal lungs. After birth, this opening closes and becomes the $Fossa \text{ } ovalis$. Therefore, the remnant of this structure is located in the interatrial septum.