Fetal circulation right before birth | Circulatory system physiology | NCLEX-RN | Khan Academy
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- เผยแพร่เมื่อ 12 ธ.ค. 2012
- Watch how the blood flows through the fetal circulation and compare it to what happens in the baby's body. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai.
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I'm really glad that you have found this video useful. I'm going to keep making these, so keep watching and share with your friends. =)
The smile shows that there are two umbilical arteries and one umbilical vein. Two eyes-arteries, smile-vein. Great video!
Genius! Thank you! :D
Or AVA. 2 arteries, 1 vein
Ofcource
You must be a doctor now😅🔥
You´re doing a great job, I really appreciate your videos! However I have to point out one big MISTAKE in this video with the blood mixing. I checked out some anatomy and physiology books and this is how it works:
So as you said from umbilical vein one part of the blood goes to liver and the other part goes through ductus venosus straight to Inferior Vena Cava (IVC). Here the oxygenated blood from umbilical vein mixes with deoxygenated blood in IVC and in the result the blood is now 67% oxygenated.
Now we get to the important part. IVC a SVC (superior vena cava) meet in the right atrium. However the blood does NOT mix in the right atrium (or it does just a little bit) and this is because of the laminar flow of blood (both in IVC and SVC). So from IVC the blood (67% oxygenated) goes through foramen ovale straight to left atrium and eventually to left ventricle and aorta ...and from SVC the blood (deoxygenated) goes to right ventricle, than to pulmonary artery and eventually most of it goes through ductus arteriosus to DESCENDING part of aorta, where it mixes with the 67% oxygenated blood creating 60% oxygenated blood
But why is this so important? Brain requires greater amount of oxygen for proper development. And the arteries supplying brain and upper limbs come out of aortic arch before the 67% oxygenated blood (from IVC) mixes in descending part of aorta with deoxygenated blood (from SVC) making the 60% oxygenated blood which goes to lower limbs.
I have tried my best to explain it, but if anyone didn´t understand and is interested in this please leave a comment
This is correct. The most oxygenated blood flows preferentially from IVC across the RA via FO to LA and onwards to the brain. less oxygenated blood from SVC flows preferentially to RV -> PA -> DA -> Aorta (beyond the right brachiocephalic artery and left common carotid supply to the brain) and then either to lower limbs or back to the placenta.
Great remark Emil Havranek, just becareful because you said ..."from SVC the blood (deoxygenated) goes to right ventricle, than to pulmonary artery and eventually most of it goes through ductus venosus to DESCENDING part of aorta, where it mixes" but it's ductus arteriosus, not venosus! I'm sure you just had a little slip! I just wanted to point it out for anyone else reading your otherwise very clear explanation :)
xx9aznfaith9xx Thank you! You´re right, I´ve corrected it and now it should be OK :)
Emil Havranek thank you .... you are amazing
+Emil Havranek thank you, you're amazing!!
This is the best explanation I have ever heard! In Anatomy, we never even discussed the fact about pressure and oxygen! Well done!
I dont even pay attention in Anatomy class anymore. I just come home and watch one of his videos, and I get nothing but 100% on my test. He just makes everything so understandable. Thanks Kahn.
A very warm Thank you from a very overwhelmed first year medical student here
Thank you for breaking this material down into simple, understandable pieces. Always in awe of how amazing everything works in A&P!
Dude YOU ARE the maaaaan!!!!!! Thank you!!!!
I was few days to my nclex exam but couldn’t study anything because of my busy schedule but thank God I linked up with Mr Riq God bless you more cuz you made it possible for me to pass at once even without preparation
Nclex exam is really difficult and frustrating,
can't believe I failed again after studying so hard
I just have 2 weeks to go please what do I do
@Eliana Masih Am sorry for what some people are passing through, I also passed through the difficulties just be patient and keep studying
@Eliana Masih Try to get yourself good help , for me I didn’t study a bit , mr riq worked for me 💯
Wow just heard someone mentioned mr riq , I thought I was the only one that this man saved from the monster called nclex
I went to like this video, but I guess I had already liked it a couple years ago. This is gold! I love that you explained the resistance; it made everything come together for me :)
This is simply amazing!!! You make things so simple....studying for the MCAT...thank you!!!
I'm a vet, it's amazing how simple yet clever mammals truly work are. Well done with this it's amazing.
I wish I could like this video more than once!!!
Thank you for making this so easy to understand! You're awesome
Just wanted to thank you for the 10 minute condensed lecture. Learned everything I needed to.
This is exactly what I am looking for. Great job! Thank you!
Excellent!! a whole chapter explaining in 11 mins I love it!!👏🏽👏🏽
I just love your videos! You always explain things perfectly. Thank you!
Absolutely brilliant! Thanks for making fetal circulation student-friendly :)
Dude you kick any professor's ass anytime!!
You make Cardiovascular Biology a lot more easy to understand with your clear drawings and explaining every step of the way! thank you! :)
Dear God in Heaven, Thank you for this! Unbelievably helpful!
Amazing video thank you! Khan Academy never fails to simplify!
Im doing first year medicine and GOD bless you, you are better than all of my lectures you should have universities and colleges begging you to teach for them :(
Mohamed Bellahcene you are living the dream! study hard :)
How's med school coming? I'm a Vet, it's so hard not to watch these vidios
Mohamed Bellahcene lol I have to learn this as well but for high school biology.
Did you graduate? 🔥
Could not have explained this in a better way. Thank you!!!!!
Hats off Rishi...U rock...
That was beautiful
such a thorough explanation, hitting most of not all the important points I needed to know.
I love that I can come to TH-cam and clarify things that aren't super clear in class. Thank you.
this is the best explanatory video I've ever watch about the subject. Thank you.
wow this lecturer is the best. thank you for making me understand.
AMAZING EXPLANATION!!! Thank you!!!!
I was so tensed about this topic as I was confused about it but you explained it very amazingly.... thank you
simple and effective illustration with great explanation . thank you.
great tutorial, better then any lecture and the comments are great to, thanks everyone please keep doing this awsome important job!
Love it !!! You're the TEACHER I wish I had...
OMG LOVE YOUR EXPLAINATION! My lecturer's only mentioned briefly and expect us to know most of the stuff. Thank goodness I found this before my finals. :P
SUPER clear, thank you so much !
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you are unbelievably amazing. thx!!
너무 도움이 됐어요! :) thank you so much
Amazing video, you made the concepts so clear. Thank you!
I can't thank you enough! it's easy and fun to learn watching your videos. My very confusing textbook reading suddenly becomes crystal clear.
Thanks for this great video! And also big thanks for the subtitles!
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thank you.that show was amazing. tried to understand it for so long, now i finaly undesdand it!!
Your video is SO great, really. I mean, the picture of this beautiful simple drawing, but even more is it the first time in a few years that i got the point with the pressure and the foramen ovale. Cool, thank you!
thank you for making this very comprehensive lesson! tysm
great graphics, great video. thank you for posting!
Great explanation! thank you so much!
Thank You for very good explanation!
this was amazing. thank you! My text book was confusing but this really helped me see how this works.
Thank you so much for your clear explanation
Loved the explanation! Such a good refresher. Thank you!
This is amazing--so clear and well-explained. Thank you!!
This is the best presentation that I have seen. Nice job!
Thank you so much... It was very helpful in understanding how the fetal circulation works. Keep up the good work.
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Thank you.
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easily memorable ........
I'm impressed. Exelent illucidation
Bless this is so much more simple and easier to grasp compared to lecture and the book
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Pure Perfection. Appreciate your work. Thank you.
Finally understood!! Thank you
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Thank you so clearly explained
wish they taught us like this in DENTAL SCHOOL! thank you very much :)
Couldn't have understood this better from reading several times and getting frustrated. Thankyou so much for making everything so easy. I don't think I'll ever miss out on the details of circulation as explained in this video.
THANK YOU UR AMAZING!! u just saved me hours of studying!
Great video! Thank you for your time and work!
Great lecture. thank you so much.
Phenomenal explanation of the fetal circulation, he makes it easy to understand and grasp. Thanks for the awesome video.
Thank you so much, currently studying for the MCAT. This helped A LOT!!
I wish I could get all of my tuition money back and give it to you because I've learned more from Khan Acadmey videos than the years I was in college. I'm studying for boards after graduating almost 3 years ago and being a visual learner, this helps me so much!! Please keep making videos!!
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So helpful!! I'm a nursing student and I was so confused about this in class. It makes so much sense now!!
now i understand it so much... thank you!
explains well. Thanks you so much!!
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Thank you. couldn't have understood better
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thank you so much for posting this...it all makes so much more sense!