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Questions and Answers
What stimulates the respiratory center when there is sudden hypoxia and hypercapnia?
Sudden hypoxia and hypercapnia
What causes the initial gasping followed by normal respiration when placental blood flow is cut off?
Stimulation of the respiratory center by hypoxia and hypercapnia
What happens to the pulmonary vascular resistance when the lungs expand during the first breath of the infant?
Immediate reduction in pulmonary vascular resistance
Why does the blood flow from the pulmonary artery to the lungs increase when the lungs expand?
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What increases the left atrial pressure, leading to the closure of the foramen ovale?
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Why does the pressure in the right atrium decrease, causing the closure of the foramen ovale?
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What leads to the closure of the foramen ovale after birth?
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In fetal circulation, which direction does the blood flow in the ductus arteriosus?
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What causes the reversal of blood flow in the ductus arteriosus from systemic aorta into pulmonary aorta in neonatal life?
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What change in pressure leads to the reversal of blood flow in the ductus arteriosus after birth?
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