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Questions and Answers
What is the primary role of the placenta in fetal circulation?
What is the primary role of the placenta in fetal circulation?
- To oxygenate and filter blood, as well as provide nutrition to the fetus (correct)
- To pump blood throughout the fetal body
- To filter blood within the fetus
- To circulate blood through the liver
Which vessel carries oxygenated blood from the placenta to the fetus?
Which vessel carries oxygenated blood from the placenta to the fetus?
- Umbilical arteries
- Inferior vena cava
- Ductus venosus
- Umbilical vein (correct)
What is the function of the ductus venosus in fetal circulation?
What is the function of the ductus venosus in fetal circulation?
- To direct blood from the right atrium to the left atrium
- To connect the pulmonary artery to the aorta
- To bypass the liver (correct)
- To bypass the fetal lungs
Why does blood primarily flow from the right atrium to the left atrium through the foramen ovale in fetal circulation?
Why does blood primarily flow from the right atrium to the left atrium through the foramen ovale in fetal circulation?
What is the role of the ductus arteriosus in fetal circulation?
What is the role of the ductus arteriosus in fetal circulation?
Which vessels carry deoxygenated blood from the fetus back to the placenta?
Which vessels carry deoxygenated blood from the fetus back to the placenta?
In fetal circulation, where does the oxygenated blood from the umbilical vein mix with deoxygenated blood?
In fetal circulation, where does the oxygenated blood from the umbilical vein mix with deoxygenated blood?
Why is it important for fetal blood to bypass the lungs during circulation?
Why is it important for fetal blood to bypass the lungs during circulation?
Which of the following statements accurately describes a difference between fetal and adult circulation?
Which of the following statements accurately describes a difference between fetal and adult circulation?
What would be the immediate effect on fetal circulation if the foramen ovale did not close after birth?
What would be the immediate effect on fetal circulation if the foramen ovale did not close after birth?
Flashcards
Umbilical Vein Function
Umbilical Vein Function
Oxygenated blood from the mother passes through the umbilical vein, bypassing the fetal liver via the ductus venosus.
Ductus Venosus
Ductus Venosus
A shunt that allows oxygenated blood to bypass the fetal liver and merge with deoxygenated blood in the inferior vena cava.
Foramen Ovale Function
Foramen Ovale Function
An opening between the right and left atria that allows most blood to bypass the pulmonary circulation in the fetus.
Ductus Arteriosus
Ductus Arteriosus
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Umbilical Arteries Function
Umbilical Arteries Function
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Right Atrium key role
Right Atrium key role
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Study Notes
- Fetal circulation differs from adult circulation because the fetus does not need as much blood to circulate through the liver or lungs.
- The mother’s body provides oxygenation, filtration, and nutrition to the fetus when in utero.
- Oxygen from the mother’s blood crosses the placenta, enters the fetus’s blood, and passes through the umbilical vein.
- Oxygenated blood bypasses the liver through the ductus venosus and combines with deoxygenated blood in the inferior vena cava.
- Blood then joins deoxygenated blood from the superior vena cava and empties into the right atrium.
- Pressure is greater in the right atrium than the left atrium, so most blood will move through the foramen ovale.
- A small amount of blood travels from the right atrium to the right ventricle into the pulmonary system.
- Most blood bypasses the pulmonary arteries and moves directly into the aorta through the ductus arteriosus and out to the rest of the body.
- Deoxygenated blood returns to the placenta through the umbilical arteries.
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