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 :)
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.
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
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 :(
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.
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!!
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 :)
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
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!!!!
As a nursing student, I can't thank you enough! I have had a couple different professors explain this to me multiple times and could never grasp it. Your drawings and explanations are fantastic and very intuitive!
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.
Wow u explained it so well...(esp the alveoli which is filled with amniotic fluid hence no exchange and hypoxia...n den the increased resistance )...I was just reading my text book and it didn't give this explaination.....thank u
I am a 3rd year nursing student and I have watched your videos ever since my prerequisites back in community college. I can't tell you just how much your simple, educational, well-explained videos have helped me grasp concepts throughout the years. Thank you so much :)
you're my favorite teacher. i never understood biology before but your videos making me super clear and i have final after three days , hopefully i will get A on anatomy just because of your videos. you're the best, thank you so much for your videos.
This afternoon, I learnt about fetus circulation, but the teacher talked so quickly, so I don't understood clearly. Thank you for making and sharing this video: )
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!
Oxygenated and non-oxygenated blood do not mix in the right atrium, they are separate streams. The oxygenated blood which comes from the IVC goes from the right to the left atrium, then from the left ventricle to the aorta, without mixing with blood which comes from the SVC. This allows arms and head to get oxygenated blood. They mix only after the ductus arteriosus.
From what I know. Highly Oxygenated Blood will travel from IVC to RA to LA to LV to Ascending Aorta to Brain. And then the blood will became Deoxygenated that will travel from SVC to RA at this time the blood will became mixed already. Why? During the flow of Oxy Blood from RA to LA there is a small amount of Oxy left in RA that cannot cross in the left side therefore when the SVC gives deoxy in RA the blood became mixed.
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😅🔥
This is the best explanation I have ever heard! In Anatomy, we never even discussed the fact about pressure and oxygen! Well done!
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!!
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.
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
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? 🔥
@@derealeristo I am in my third year of medical college
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!
Tania Kirchner its now teachers fault when you are not giving the lecture proper attention??
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.
A very warm Thank you from a very overwhelmed first year medical student here
Dude YOU ARE the maaaaan!!!!!! Thank you!!!!
I'm a vet, it's amazing how simple yet clever mammals truly work are. Well done with this it's amazing.
You make Cardiovascular Biology a lot more easy to understand with your clear drawings and explaining every step of the way! thank you! :)
Dude you kick any professor's ass anytime!!
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!!
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 :)
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
I now understand fetal circulation!! woohoo. I'm more confident about my upcoming nursing exam. Thanks so much!!
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!!!!
As a nursing student, I can't thank you enough! I have had a couple different professors explain this to me multiple times and could never grasp it. Your drawings and explanations are fantastic and very intuitive!
I think this video definitely helps explain it much easier for us nurses!
First year studying nursing! same thing!
Im a forth year medical student and this is my first time understanding the fetal circulation, thank u so much
Loved this, very helpful. Can you post the picture though so that we can follow along? Can you do this with future videos too?
This is simply amazing!!! You make things so simple....studying for the MCAT...thank you!!!
Just wanted to thank you for the 10 minute condensed lecture. Learned everything I needed to.
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.
I love that I can come to TH-cam and clarify things that aren't super clear in class. Thank you.
THANK YOU UR AMAZING!! u just saved me hours of studying!
I swear this video helped me pass my labour and birth exam! Thanks
Best explanation ever.....even explained why pulm. Vascular resistance is high before birth 🤩🤩
This was amazing! Just the right visual I needed to put it all together! Future RT here
i always found teh fetal circulations in parts, this is the BEST explanation . thank you so much
Phenomenal explanation of the fetal circulation, he makes it easy to understand and grasp. Thanks for the awesome video.
This is the best presentation that I have seen. Nice job!
So helpful!! I'm a nursing student and I was so confused about this in class. It makes so much sense now!!
I was so tensed about this topic as I was confused about it but you explained it very amazingly.... thank you
So so so much lucky to find this level of content absolutely free on youtube ^_^
I am currently Studying for the MCAT and I have to say this video was extremely helpful and informative.
Wonderful! A much better teacher than my professor!
Bless this is so much more simple and easier to grasp compared to lecture and the book
subhanallah and thanks..i enjoyed watching this and really helped me to understand what actuality of theory written on many books..
wow this lecturer is the best. thank you for making me understand.
Thank you for breaking this material down into simple, understandable pieces. Always in awe of how amazing everything works in A&P!
Could not have explained this in a better way. Thank you!!!!!
wish they taught us like this in DENTAL SCHOOL! thank you very much :)
Dear God in Heaven, Thank you for this! Unbelievably helpful!
Wow u explained it so well...(esp the alveoli which is filled with amniotic fluid hence no exchange and hypoxia...n den the increased resistance )...I was just reading my text book and it didn't give this explaination.....thank u
You are helping me so much in medical school!
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.
Thank you so much. Your videos are getting me through anesthesia school! Cant thank you enough.
this is the best explanatory video I've ever watch about the subject. Thank you.
I am a 3rd year nursing student and I have watched your videos ever since my prerequisites back in community college. I can't tell you just how much your simple, educational, well-explained videos have helped me grasp concepts throughout the years. Thank you so much :)
Absolutely brilliant! Thanks for making fetal circulation student-friendly :)
Yay! Now Im ready to ACE my patho midterm!!!!
That made so much more sense then my textbook or notes. Thanks.
love you , a medical student from Kosovo
Makes so much more sense than my text book and diagrams, thank you!! :)
simple and effective illustration with great explanation . thank you.
Thank you Khan Academy. You've helped me a lot with Physics, Chemistry and Biology.
너무 도움이 됐어요! :) thank you so much
unbelievable. you make something that seems so hard so simple to understand. Thank you soooooooo much!
Hats off Rishi...U rock...
you're my favorite teacher. i never understood biology before but your videos making me super clear and i have final after three days , hopefully i will get A on anatomy just because of your videos. you're the best, thank you so much for your videos.
if only all my teachers taught like you. I LOVE pictures!!!
This really helped me!! As a stressed out nursing student thank you so much 🤓❤
Amazing video thank you! Khan Academy never fails to simplify!
Thank you sir you have saved my life, nice explanation
Eish.....this is so good....I have really understood....big up
This afternoon, I learnt about fetus circulation, but the teacher talked so quickly, so I don't understood clearly. Thank you for making and sharing this video: )
Really well Done! Greetings from a german Pediatrician!
Yet again, another nursing student thanks you!!!
Excellent vedio....I really appreciate it...thanku so much
Assalamualykum.......
From this video... I can make a good notes for my exams.......
Your explanation and visuals are better then the book I'm reading, thank you!
Better than my anatomy lecture. This is an awesome vid!
one of the best khan videos I have seen to date, thank you
thank you for making this very comprehensive lesson! tysm
Excellent!! a whole chapter explaining in 11 mins I love 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!
Oxygenated and non-oxygenated blood do not mix in the right atrium, they are separate streams.
The oxygenated blood which comes from the IVC goes from the right to the left atrium, then from the left ventricle to the aorta, without mixing with blood which comes from the SVC.
This allows arms and head to get oxygenated blood.
They mix only after the ductus arteriosus.
From what I know. Highly Oxygenated Blood will travel from IVC to RA to LA to LV to Ascending Aorta to Brain. And then the blood will became Deoxygenated that will travel from SVC to RA at this time the blood will became mixed already. Why? During the flow of Oxy Blood from RA to LA there is a small amount of Oxy left in RA that cannot cross in the left side therefore when the SVC gives deoxy in RA the blood became mixed.
Finally understood!! Thank you
You did a great explanation. I've learned more from your videos rather than the explanation of my professor.
Thank you. This video is great. You're a gifted teacher like Sal.
thank you.that show was amazing. tried to understand it for so long, now i finaly undesdand it!!
thank you!! I wasn't so sure what exactly I needed to know about ductus venosus. I don't know how many As I owe you, please keep great works coming!
thank you so much for posting this...it all makes so much more sense!
Thank u this helped for my exam!! Great job
this was amazing. thank you! My text book was confusing but this really helped me see how this works.
Thank you so much, currently studying for the MCAT. This helped A LOT!!
u made it much simpler :)
a med student ,, thank u
Khan Ur lectures I mean all of the amazing... thnq you so so much... Allan bless you.
very helpfull and clear video... Helped me a lot!
This was quality thank you
That was beautiful
such a thorough explanation, hitting most of not all the important points I needed to know.
I wish I could like this video more than once!!!
Thank you for making this so easy to understand! You're awesome
Thank you!! Helped me to score a 90 on my quiz!!! Very grateful
very well presented. thank you.
This video is great! You are a wealth of knowledge!
Thank you so much! Life saver for the MCAT!
Thank you. couldn't have understood better
Thank you for this awesome video. This helps a lot because our lecturer didn't explain it well.
SUPER clear, thank you so much !