What is the purpose of the ductus arteriosus while the fetus is developing in utero?
a. to divert blood from the fetal lungs to the fetal aorta
b. to circulate blood throughout the fetal body and back to the placenta
c. to move blood between the various chambers of the fetal heart
d. to direct blood immediately to the fetal liver
A
Feedback
A Correct. The ductus arteriosus (a blood vessel connecting the aorta with the pulmonary artery) is used to divert blood from the fetal lungs to the fetal aorta as the lungs do not participate in gas exchange in utero. This structure usually closes after birth.
B Incorrect. The ductus arteriosus does not circulate blood throughout the fetal body and back to the placenta. This is the role of the umbilical cord.
C Incorrect. The ductus arteriosus does not move blood between the various chambers of the fetal heart.
D Incorrect. The ductus arteriosus does not direct blood immediately to the fetal liver.
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