Which Opening in the Interatrial Septum of the Fetal Heart

Question

Which opening in the interatrial septum of the fetal heart connects the right and left atrium?
A)fossa ovalis
B)ductus arteriosus
C)ligamentum arteriosum
D)foramen ovale

Accepted Answer

The opening in the interatrial septum of the fetal heart that connects the right and left atrium is called the foramen ovale. This opening allows blood to bypass the non-functioning fetal lungs and enter the left atrium, where it can be pumped out to the body. After birth, the increase in oxygen levels causes the foramen ovale to close and eventually become the fossa ovalis.