Which blood vessels are in the placenta?

2 umbilical arteries; 1 umbilical vein

What is the purpose of the umbilical vein?

it brings oxygenated blood from the mother to the fetus

Trace the flow of oxygenated blood from the placenta to the heart

oxygenated blood from the mom passes to the umbilical vein in the placenta; next it goes to the liver; from here it divides into the hepatic vein and the ductus venosus; the blood from the ductus venosus joins the IVC, then goes to the RA

What is special about the blood entering the right atrium of the fetus?

it is "purple" - mix of oxygenated (red) and deoxygenated (blue) blood; oxygenated from the ductus venosus (thru the IVC) and deoxygenated from the SVC

Where does blood flow as it leaves the right atrium?

it goes to either right ventricle (and then pulmonary trunk) or to the foramen ovale which brings it directly to the left atrium, bypassing the lungs

What happens to the blood that makes it to the pulmonary trunk?

it either goes to the lungs and then the pulmonary veins, left atrium, left ventricle, and aorta OR it passes through the ductus arteriosis to the aorta, again bypassing the lungs

Why is much of the fetus' blood diverted from the lungs

the lungs are not yet functional; the oxygenated blood is received from the mother through the placenta; the lungs just need a small amount of blood to keep them viable

How is waste processed from the fetus?

waste is passed through the umbilical arteries (which are supplied from the internal iliac arteries)

What are the 3 circulation changes that happen at birth?

1) the ductus venosus becomes the ligamentum venosum; 2) the foramen ovales becomes the fossa ovalis; 3) the ductus arteriosis becomes the ligamentum arteriosum

Where is the highly oxygenated blood found in the fetus?

from the umbilical vein (beginning at the placenta) through the liver to where it joins with the IVC

Where is the moderately oxygenated blood found in the fetus?

from the IVC (where it is joined by the umbilical vein) up through the heart to the aortic arch; partially oxygenated blood is found through the arteries

Where is deoxygenated blood found in the fetus?

all veins, except the umbilical vein and the section of the IVC after the umbilical vein joins in

What happens to the umbilical arteries and umbilical vein at birth?

the umbilical arteries become the medial umbilical ligaments; the umbilical vein becomes the ligamentum teres

Help

Options

focusNode

Didn't know it?
click below

Knew it?
click below

Don't Know

Remaining cards (0)

Know

retry

shuffle

restart

0:00

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

BIO161-Fetal Circula

Fetal Circulation

Question	Answer
Which blood vessels are in the placenta?	2 umbilical arteries; 1 umbilical vein
What is the purpose of the umbilical vein?	it brings oxygenated blood from the mother to the fetus
Trace the flow of oxygenated blood from the placenta to the heart	oxygenated blood from the mom passes to the umbilical vein in the placenta; next it goes to the liver; from here it divides into the hepatic vein and the ductus venosus; the blood from the ductus venosus joins the IVC, then goes to the RA
What is special about the blood entering the right atrium of the fetus?	it is "purple" - mix of oxygenated (red) and deoxygenated (blue) blood; oxygenated from the ductus venosus (thru the IVC) and deoxygenated from the SVC
Where does blood flow as it leaves the right atrium?	it goes to either right ventricle (and then pulmonary trunk) or to the foramen ovale which brings it directly to the left atrium, bypassing the lungs
What happens to the blood that makes it to the pulmonary trunk?	it either goes to the lungs and then the pulmonary veins, left atrium, left ventricle, and aorta OR it passes through the ductus arteriosis to the aorta, again bypassing the lungs
Why is much of the fetus' blood diverted from the lungs	the lungs are not yet functional; the oxygenated blood is received from the mother through the placenta; the lungs just need a small amount of blood to keep them viable
How is waste processed from the fetus?	waste is passed through the umbilical arteries (which are supplied from the internal iliac arteries)
What are the 3 circulation changes that happen at birth?	1) the ductus venosus becomes the ligamentum venosum; 2) the foramen ovales becomes the fossa ovalis; 3) the ductus arteriosis becomes the ligamentum arteriosum
Where is the highly oxygenated blood found in the fetus?	from the umbilical vein (beginning at the placenta) through the liver to where it joins with the IVC
Where is the moderately oxygenated blood found in the fetus?	from the IVC (where it is joined by the umbilical vein) up through the heart to the aortic arch; partially oxygenated blood is found through the arteries
Where is deoxygenated blood found in the fetus?	all veins, except the umbilical vein and the section of the IVC after the umbilical vein joins in
What happens to the umbilical arteries and umbilical vein at birth?	the umbilical arteries become the medial umbilical ligaments; the umbilical vein becomes the ligamentum teres

Created by: debmurph

"Know" box contains:
Time elapsed:
Retries: