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Anatomy And Physiology II (APII) Exam 2 Practice Test

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What connects the pulmonary and aortic trunks?
Correct Answer:
Ductus arteriosus
Explanation:
In fetal circulation, the ductus arteriosus directly links the pulmonary trunk to the aorta. This shunt lets most blood bypass the nonfunctional lungs and enter the systemic circulation, delivering well-oxygenated blood to the body. After birth, it constricts and becomes the ligamentum arteriosum. The other structures have different roles: the foramen ovale connects the right and left atria to bypass the fetal lungs at the atrial level; the ductus venosus shunts blood from the umbilical vein to the inferior vena cava; and the umbilical vein carries oxygenated blood from the placenta to the fetus.

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