Physiology Hypoxic pulmonary vasoconstriction: A Depends more on the PO2 of mixed venous blood than alveolar gas B Is released in the transition from placental to air respiration C Involves CO2 uptake in vascular smooth muscle D Paly dives blood flow from well-ventilated regions of diseased lungs 💡 Explanation Hypoxic pulmonary vasoconstriction: ✓ Correct Answer: B. Is released in the transition from placental to air respiration