In the fetus, what two structures allow most blood to bypass the lungs?
A) fossa ovalis and ligamentum arteriosum
B) foramen ovale and ductus arteriosus
C) fossa ovalis and ductus arteriosus
D) foramen ovale and ligamentum arteriosum

Question

Quizplus · Accepted Answer

The foramen ovale allows blood to flow directly from the right atrium to the left atrium, bypassing the lungs, and the ductus arteriosus connects the pulmonary artery to the aorta, allowing most of the blood to bypass the lungs as well.

In the Fetus, What Two Structures Allow Most Blood to Bypass