In fetal circulation, most blood will bypass the fetal lungs via the:
a. inferior vena cava c. foramen ovale
b. ductus venosus d. ductus arteriosus
C
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A Incorrect. In fetal circulation, most blood will not bypass the fetal lungs via the inferior vena cava, instead most of the blood from the placenta enters the inferior vena cava on the way directly to the heart, thus bypassing the lungs.
B Incorrect. In fetal circulation, most blood will not bypass the fetal lungs via the ductus venosus; 60% of the blood from the placenta passes through the ductus venosus directly into the inferior vena cava.
C Correct. In fetal circulation, most blood will bypass the fetal lungs via the foramen ovale, an opening between the right and left atria of the fetal heart.
D Incorrect. In fetal circulation, most blood will not bypass the fetal lungs via the ductus arteriosus, however, a large amount of blood from the placenta travels through the ductus arteriosus (channel between the main pulmonary artery and the aorta).
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