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When the baby is born and the lungs are fully functional, the blood from the left atrium pushes the septum primum and secundum together, creating a(n) ______ interatrial septum.

Respuesta :

When the baby is born and the lungs are fully functional, the blood from the left atrium pushes the septum primum and secundum together, creating a closed interatrial septum.

What is Interatrial septum ?

The right and left atria of the heart are divided by a thin tissue wall called the interatrial septum. Its primary job in adults is to keep the two atrial chambers apart to prevent blood shunting between them.

  • The roof of the embryologic atrium is invaded to create the muscular top part of the atrial septum (septum secundum). The limbus designates the inferior free edge of the limb. The thin septum primum tissue that links with the fused endocardial cushions forms the lowest portion of the atrial septum.

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