Fetal Respiration and Circulation

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10 Questions

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?

Reduction in pulmonary vascular resistance

What increases the left atrial pressure, leading to the closure of the foramen ovale?

Return of oxygenated blood from the lungs to the left atrium

Why does the pressure in the right atrium decrease, causing the closure of the foramen ovale?

Decrease in pressure in the inferior vena cava

What leads to the closure of the foramen ovale after birth?

High pressure in the left atrium and low pressure in the right atrium

In fetal circulation, which direction does the blood flow in the ductus arteriosus?

From pulmonary artery into aorta

What causes the reversal of blood flow in the ductus arteriosus from systemic aorta into pulmonary aorta in neonatal life?

Systemic arterial pressure being higher than pulmonary arterial pressure

What change in pressure leads to the reversal of blood flow in the ductus arteriosus after birth?

Higher systemic arterial pressure than pulmonary arterial pressure

Learn about the unique fetal circulation system and how it differs from that of adults due to the presence of the placenta. Explore the development of the fetal heart and blood vessels, as well as the role of the placenta in gas exchange.

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