Which of the following is NOT a major physiologic change that occurs during the fetal transition process?
A. The pulmonary vasculature dilates, causing decreased blood flow through the ductus arteriosus.
B. The infant breathes spontaneously, causing alveolar fluid to be absorbed in the lung parenchyma.
C. The umbilical vessels are clamped and cut, which removes the high-resistance placental circuit.
D. The pulmonary blood vessels dilate, which causes blood to flow preferentially into the lungs.
Answer: C. The umbilical vessels are clamped and cut, which removes the high-resistance placental circuit.
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