The fetal structure that permits blood to flow from the right atrium to the left atrium is the:
A)foramen ovale
B)ductus arteriosus
C)ductus venosus
D)foramen magnum

Question

Quizplus · Accepted Answer

The foramen ovale is a fetal structure that allows blood to flow from the right atrium to the left atrium, bypassing the lungs. This is necessary in the fetus because the lungs are not yet functional for breathing. After birth, the foramen ovale normally closes as the lungs become functional and the pressure in the left atrium increases.

The Fetal Structure That Permits Blood to Flow from the Right