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Fetal Circulation

Fetal Circulation. Some key features & differences…. Important Structures. Ductus Arteriosus Runs from pulmonary artery to aorta Bypasses lungs in fetus Collapses at birth due to demand of lungs for blood. Foramen Ovale Left & right atria both have a “hole” in inside wall

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Fetal Circulation

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  1. Fetal Circulation Some key features & differences…

  2. Important Structures • DuctusArteriosus • Runs from pulmonary artery to aorta • Bypasses lungs in fetus • Collapses at birth due to demand of lungs for blood

  3. Foramen Ovale • Left & right atria both have a “hole” in inside wall • Allows blood to flow from right to left atria  bypasses lungs! • Expansion of left atrium at birth puts 2 holes out of alignment

  4. DuctusVenosus • Stops carrying blood from moment of birth • Channel through liver that carries blood from placenta to inferior vena cava • Approx ½ blood enters liver • Approx ½ blood bypasses liver  ductus venosus  inferior vena cava  heart

  5. Umbilical Artery • Carries blood LOW in oxygen/nutrients from baby to mom • Umbilical Vein - Carries blood RICH in oxygen/nutrients from mom to baby

  6. Key Differences • Umbilical vein transports oxygen rich blood to the fetus • Fetal blood has a much greater capacity to carry oxygen • Vein carries blood to the liver and is partially shunted by the ductusvenosus this allows about half the blood to bypass the liver! • The ductus joins the inferior vena cava • Blood from the lower part of the fetal body is mixed with oxygen rich blood from the placenta

  7. Blood is forced into the right atrium. • The fetal heart has an opening between the right and left atria that shunts blood away from the lungs. • This opening is called the foramen ovale. • The ductusarteriosus conducts blood away from the pulmonary trunk to the aorta (lung bypass).  

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