15 terms

Ch 2 Fetal Gas Exchange and Circulation

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What does the fetus depend on for gas exchange?
Mom's circulation
Do the fetal and maternal blood touch at all?
Nope
What blood vessels are inside the umbilical cord?
2 small arteries
1 large vein
What protects the blood vessels of the umbilical cord and prevents kinking?
Wharton's jelly
What is the first organ formed in a fetus?
heart
How long does it take for the heart to be fully functional?
5 weeks
Which of mom's organs perform the most work for the baby?
lungs and liver
Is fetal circulation different from after birth circulation?
Yes
What are the 3 fetal shunts?
Ductus venosus
foramen ovale
ductus arteriosus
What does the ductus venosus bypass?
liver
What does the foramen ovale shunt?
the right and left atria
What does the ductus arteriosus shunt blood away from and where does it direct it?
away from the lungs and to the aorta
What percent of the ductus closes within a day?
20%
What percent of the ductus closes witing 2 days?
80%
What percent of the ductus closes within 4 days?
100%
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