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13 Cards in this Set

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