Fetal Circulation- Review Q's

Which organ systems in the fetus are nonfunctional?

respiratory, lymphatic, digestive, urinary

What organ provides for their functions before birth?

placenta

Which blood vessel takes red blood from the umbilical vein to the inferior vena cava

ductus venosus

List the two bypasses of the lungs

foramen ovale and ductus arteriosus

Hw many umbilical arteries are there?

2

The umbilical arteries branch off from what other arteries?

internal iliac

Do the umbilical arteries carry red, mixed, or “blue” blood?

mixed

Where do umbilical arteries take the blood?

placenta

How many vessels are in the umbilical cord?

3

Is lung compliance high or low during the first breaths?

low

Does this mean the first breaths especially easy or especially difficult?

difficult

Before birth, the pressure in the right atrium is higher than in the left atrium. After birth, which side has higher pressure?

Left

What happens at birth because of this pressure change?

foramen ovale closes

What causes the ductus arterious to close?

higher O₂ availability after birth enables sm. muscle in its way to constrict

What does the ductus arteriosus become after birth?

ligamentum arteriosum

What does the umbilical vein become after birth

round ligament of liver

What does the foramen ovale become after birth

fossa ovalis