Fetal Circulation

Question 1

Fetal Circulatory Needs

Answer 1

1. all waste and nutrients and O2 exchange occur across the placenta
2. lungs are not functional. Lung has increased resistance to blood flow

Question 2

Structures of the fetus not found in the adult

Answer 2

1. umbilical arteries
2. ductus venosus
3. foramen ovale
4. umbilical vein
5. ductus arteriosus

Question 3

Umbilical Arteries

Answer 3

take blood from fetal circulation out the umbilicus

Question 4

Ductus Venosus

Answer 4

shunt taking blood from umbilical vein to hepatic arteries, bypassing capillary bed of liver

Question 5

Foramen Ovale

Answer 5

gap between right and left atria

Question 6

Ductus Arteriosus

Answer 6

pulmonary trunk to aortic arch

Question 7

Adult equivalent of umbilical arteries

Answer 7

round ligaments of the bladder

Question 8

adult equivalent of umbilical vein

Answer 8

round ligament of the liver

Question 9

adult equivalent of the ductus venosus

Answer 9

ligamentum venosum

Question 10

adult equivalent of the ductus arteriosus

Answer 10

ligamentum arteriosum

Question 11

adult equivalent of the foramen ovale

Answer 11

fossa ovalis