Foetal Circulation Flashcards Preview

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Flashcards in Foetal Circulation Deck (11):
1

In the foetal heart, what connects the umbilical vein (coming from placenta) to the IVC?

Ductus venosus

2

What is the importance of the ductus venosus?

Allows most of the blood from placenta to bypass the liver and go straight to heart

3

In the foetal heart, what connects the right atrium to the left atrium?

Foramen ovale

4

What is the importance of the foramen ovale?

Enables oxygenated blood entering RA (from IVC from umbilical vein from placenta) to enter LA, bypassing pulmonary circulation, i.e. oxygenated blood is not sent to the lungs

5

Once oxygenated blood has moved through the foramen ovale, where does it go?

Enters LV and pumped into the aorta to the body, importantly the brain

6

In the foetal heart, what connects the pulmonary artery to the descending aorta?

Ductus arteriosus

7

What is the importance of the ductus arteriosus?

Enables deoxygenated blood pumped through pulmonary artery to enter descending aorta to go to placenta to get oxygenated

8

Do the lungs take part in gas exchange in the foetus?

No, hence why the pulmonary circulation is cleverly bypassed in the foetal heart

9

What results in closure of the foramen ovale?

Baby's first breath after delivery (usually)

10

What is the remnant of the umbilical vein in adults?

Ligamentum teres

11

What is the remnant of the ductus venosus in adults?

Ligamentum venosus