In the transition from fetal to neonatal circulation, what structure closes between the right and left atrium?
a. Ductus arteriosus c. Ductus venosus
b. Foramen ovale d. Ductus pulmonosus
B
Foramen ovale is the opening between the fetal atria to bypass the lungs. Ductus arteriosus is the fetal shunt that shunts blood from the pulmonary artery to the descending aorta, bypassing the lungs. Ductus venosus is the fetal shunt that shunts blood from the liver to the inferior vena cava, bypassing the liver. Ductus pulmonosus is not a fetal shunt.
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