Fetal circulation right before birth | Circulatory system physiology | NCLEX-RN | Khan Academy

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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[@khanacademymedicine]

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. =)

[@pisces31493]

The smile shows that there are two umbilical arteries and one umbilical vein. Two eyes-arteries, smile-vein. Great video!

[@mariafaltass1308]

Genius! Thank you! :D

[@docfromthesouthbeifong3142]

Or AVA. 2 arteries, 1 vein

[@harendrasolanki4147]

Ofcource

[@kofisarpong4505]

You must be a doctor now😅🔥

[@astrydphoebeward]

This is the best explanation I have ever heard! In Anatomy, we never even discussed the fact about pressure and oxygen! Well done!

[@nameinaframeindy]

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.

[@MandyGR]

Dude YOU ARE the maaaaan!!!!!! Thank you!!!!

[@emilhavranek9256]

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

[@almcc6416]

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.

[@xx9aznfaith9xx]

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 :)

[@emilhavranek9256]

xx9aznfaith9xx Thank you! You´re right, I´ve corrected it and now it should be OK :)

[@noornana4190]

Emil Havranek thank you .... you are amazing

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+Emil Havranek thank you, you're amazing!!

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Thank you for breaking this material down into simple, understandable pieces. Always in awe of how amazing everything works in A&P!

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This is simply amazing!!! You make things so simple....studying for the MCAT...thank you!!!

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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 :)

[@zeeshanmansuri3714]

Hats off Rishi...U rock...

[@krombopulosmichael6445]

I'm a vet, it's amazing how simple yet clever mammals truly work are. Well done with this it's amazing.

[@mastura8789]

You make Cardiovascular Biology a lot more easy to understand with your clear drawings and explaining every step of the way! thank you! :)

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Just wanted to thank you for the 10 minute condensed lecture. Learned everything I needed to.

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[@felixetcetera]

Absolutely brilliant! Thanks for making fetal circulation student-friendly :)

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A very warm Thank you from a very overwhelmed first year medical student here

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I wish I could like this video more than once!!! Thank you for making this so easy to understand! You're awesome

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teacher explained this twice and it took an hour... confused the heck out of everyone.... you do it in 12 minutes.... and aha!!....Got it! Thanks!

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Tania Kirchner its now teachers fault when you are not giving the lecture proper attention??

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Students can learn in different ways, maybe it's easier for students to learn visually with drawings and audio that makes sense with someone who takes the time to really explain.

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Mohamed Bellahcene lol I have to learn this as well but for high school biology.

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[@christineclarke117]

I just love your videos! You always explain things perfectly. Thank you!

[@rbdsmadmaster]

this is the best explanatory video I've ever watch about the subject. Thank you.

[@Sapphire093]

Could not have explained this in a better way. Thank you!!!!!

[@ardnaxelaprincess19]

i always found teh fetal circulations in parts, this is the BEST explanation . thank you so much

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I love that I can come to KZbin and clarify things that aren't super clear in class. Thank you.

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I read my book several times to try to understand this and I couldn't. I watched your video only twice and feel like I mastered it and it was FREE! Thank you so much!!!!

[@yummycandy22]

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.

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[@Redr0ses101]

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You are helping me so much in medical school!

[@myjunihond]

Thank you so much... It was very helpful in understanding how the fetal circulation works. Keep up the good work.

[@uriahfingerhut1408]

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[@wonjungchon]

wow this is amazing. thank you so much!

[@milenaorellana4205]

Great explanation! thank you so much!

[@jeampierrecruz]

Phenomenal explanation of the fetal circulation, he makes it easy to understand and grasp. Thanks for the awesome video.

[@stephanieadams8886]

this was amazing. thank you! My text book was confusing but this really helped me see how this works.

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Bless this is so much more simple and easier to grasp compared to lecture and the book

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explains well. Thanks you so much!!

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one of the best way of explanation.... easily memorable ........

[@hiliof123]

Finally understood!! Thank you

[@snehachandiramani255]

wish they taught us like this in DENTAL SCHOOL! thank you very much :)

[@SuperEiram25]

now i understand it so much... thank you!

[@magsauced]

great graphics, great video. thank you for posting!

[@greenyellowmanilla]

AMAZING! Thank you I have been struggling to understand this for so long. Continue the great work.

[@suneetasingh01]

Amazing, you have explained it so well👍

[@jenya1924]

Best explanation ever.....even explained why pulm. Vascular resistance is high before birth 🤩🤩

[@n.ischiadicus1412]

Thanks for this great video! And also big thanks for the subtitles!

[@11SaRaH06]

thank you so much for posting this...it all makes so much more sense!

[@mesunshine3446]

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!

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Thank you so much! Life saver for the MCAT!

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This is the most beautiful diagram/explanation I’ve ever seen 😍 thank you!

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oo

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pure quality, thank you sir

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Loved the explanation! Such a good refresher. Thank you!

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Better than my anatomy lecture. This is an awesome vid!

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THIS IS GOLD!

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I swear this video helped me pass my labour and birth exam! Thanks

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subhanallah and thanks..i enjoyed watching this and really helped me to understand what actuality of theory written on many books..

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A wonderful video on fetal circulation

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You explain everything so clearly!

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if only all my teachers taught like you. I LOVE pictures!!!

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So much helpful thanks for the video..

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This is the best presentation that I have seen. Nice job!

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Your explanation and visuals are better then the book I'm reading, thank you!

[@melanievidal6885]

very well presented. thank you.