Physiology In fetal circulation, pulmonary vascular resistance is more than systemic vascular resistance. At which stage, it becomes normal to adult level? A 4-10 weeks B 3-7 weeks C 10-14 weeks D 20-22 weeks 💡 Explanation In fetal circulation, pulmonary vascular resistance is more than systemic vascular resistance. At which stage, it becomes normal to adult level? ✓ Correct Answer: A. 4-10 weeks