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12 Cards in this Set
- Front
- Back
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Unlike adults, the _____ _____ of the fetal heart receives highly oxygenated and nutrient laden blood fromt the _______ _____ ______ which has in turn received its blood from the _____ _____ and ultimately, the _______.
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1-Right side
2- Inferior vena cava 3- Umbilical Cord 4- Placenta |
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What is the foramen ovale?
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An opening between the right and lft atria.
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What does the foramen ovale allow?
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Highly oxygenated blood returning from the placenta to the right atrium to cross directly over to the left side, bypassing the lungs, and going into peripheral circulation. (After birth the foramen ovale begins to seal up)
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What is the ductus arteriosis?
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A vessel that joins the pulmonary artery to the aorta.
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What does the ductus arteriosis do?
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It allows oxygenated blod to bypass the lungs and enter straight into peripheral circulation. (It seals up after birth and becomes ligament like)
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What is the ductus venosus?
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A fetal liver bypass
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What does the ductus venosus do?
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It allows the inferior vena cava to transport nutrient laden blood directly to the right side of the heart (right atrium).
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What happens to the allantois after birth?
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It is tied off with ligatures, cut and knotted.
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What are happens to the iliac arteries?
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They become much smaller after birth.
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Twins that arise from separately fertilized eggs are called what?
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Dizogotic Twins
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Monozygotic twins develop from what?
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The same zygote and are genetically identical.
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When does separation of the zygote into monozygotic twins occur?
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At the end of the 2 cell stage during the cleavage divisions.
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