What term is used to describe the patent opening between the aorta and pulmonary artery in a fetus?
a. Foramen ovale
b. Sinus venosus
c. Ductus arteriosus
d. Septal defect
ANS: C
In the fetal circulation, the ductus arteriosus is an opening between the aorta and the pulmonary artery. The foramen ovale allows flow of blood between the left and right atrium. The sinus venosus is a type of atrial septal defect. The septal defect is an opening in the heart's septum.
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