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13 Cards in this Set
- Front
- Back
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what is the umbilical cord formed from?
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chorionic villi, when they form and begin to function, they join together into larger and larger veins and arteries until they become the umbilical cord.
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what is the average length and diameter of an umbilical cord?
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55 cm long and 2 cm in diameter.
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what does the umbilical cord contain?
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one vein and two arteries.
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What is the function of the umbilical cord?
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transport oxygen and nutrients to the fetus and return waste products from the fetus to the placenta.
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What is the bulk of the cord made of?
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a gelatinous mucopolysaccaride called Wharton's Jelly.
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what is the purpose of Wharton's Jelly?
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prevent compression of the cord in utero.
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What happens in about 1% of umbilical cords?
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they have only 2 vessels, an artery and a vein.
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What may be associated with the condition of only 2 vessels?
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cardiac and GI systems.
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what is a nuchal cord?
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a loose loop of cord around the neck.
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In about what % of deliveries is a nuchal cord present?
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20%
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what happens as early as the 12th day of pregnancy?
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maternal blood begins to collect in the intervillous spaces.
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By what week do oxygen and other nutrients pass from the maternal blood through the chorionic villi to the embryo.
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3rd or 4th week
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What four process do substances cross the placenta by?
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diffusion
facilitated diffusion active transport pinocytosis |
