Flashcards in Foetal Circulation Deck (11):
In the foetal heart, what connects the umbilical vein (coming from placenta) to the IVC?
What is the importance of the ductus venosus?
Allows most of the blood from placenta to bypass the liver and go straight to heart
In the foetal heart, what connects the right atrium to the left atrium?
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
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
In the foetal heart, what connects the pulmonary artery to the descending aorta?
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
Do the lungs take part in gas exchange in the foetus?
No, hence why the pulmonary circulation is cleverly bypassed in the foetal heart
What results in closure of the foramen ovale?
Baby's first breath after delivery (usually)
What is the remnant of the umbilical vein in adults?