Which of the Following Structures Serves as the "Lungs" for the Fetus

Question

Which of the following structures serves as the "lungs" for the fetus?
A) Ductus venosus
B) Ductus arteriosus
C) Placenta
D) Foramen ovale

Accepted Answer

The placenta is the site of gas exchange between the fetal and maternal circulation, and serves as the "lungs" for the fetus. The ductus venosus, ductus arteriosus, and foramen ovale are all structures that serve to bypass certain fetal circulatory pathways, but they do not serve as the "lungs" for the fetus.