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Regulation of blood pressure with baroreceptors | NCLEX-RN | Khan Academy

Оценок: 1775 | Просмотров: 455036
Learn about how the arteries use nerve impulses to help regulate blood pressure. Rishi is a pediatric infectious disease physician and works at Khan Academy. Created by Rishi Desai. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn-circulatory-system/rn-blood-pressure-control/v/parts-of-a-nephron?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn Missed the previous lesson? https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn-circulatory-system/blood-pressure/v/blood-pressure-changes-over-time?utm_source=YT&utm_medium=Desc&utm_campaign=Nclex-rn NCLEX-RN on Khan Academy: A collection of questions from content covered on the NCLEX-RN. These questions are available under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License (available at http://creativecommons.org/licenses/by-nc-sa/3.0/us/). About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content. For free. For everyone. Forever. #YouCanLearnAnything Subscribe to Khan Academy’s NCLEX-RN channel: https://www.youtube.com/channel/UCDx5cTeADCvKWgF9x_Qjz3g?sub_confirmation=1 Subscribe to Khan Academy: https://www.youtube.com/subscription_center?add_user=khanacademy
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Текстовые комментарии (131)
Princess Sarah Contreras-Gregersen (17 дней назад)
very understandable, thank you <3
Jade Slack (22 дня назад)
This video is all wrong
Shiva Merla (3 месяца назад)
There are many systems for regulation this only explains the baroreceptor reflex it would be nice if u explain the other systems as well...😁
Juhi Mittal (5 месяцев назад)
9 and 10 nerve end up in tractus solitarius which is actually in medulla oblongata (not midbrain).
simon Kerner (9 месяцев назад)
The video describes two arteries, left and right brachial arteries, they aren’t. They are the left and right subclavian arteries. The brachial arteries are in the arms. Can’t comment on the rest of the video as I stoped watching at this point. IMO, if they get this very basic anatomy wrong I can’t trust it a simple a revision source for my imminent exams.
Saharin Cuker (9 месяцев назад)
Cheers for the video content! Apologies for butting in, I would appreciate your opinion. Have you researched - Marnaavid Unexplainable Intervention (Have a quick look on google cant remember the place now)? It is an awesome one of a kind product for learning how to hack your flow state minus the normal expense. Ive heard some interesting things about it and my work buddy at very last got astronomical results with it.
Adriena Redlová (11 месяцев назад)
No response? What about vasomotor tone? :)
EyeYannie (11 месяцев назад)
thank you so much!!!!! this video saved me
gboyega odutayo (4 месяца назад)
Prabhakar Kundurthy (1 год назад)
Great lecture
Vighnesh Vasanthanathan (1 год назад)
pls enlighten me. If we say an indvidual exercises, and to maintain homeostasis, the peripheral and central chemoreceptors send signals to the medullar oblongata, and then it sends nerve impulses to the effectors to increase exhalationa and inhalation. With regards to the cardiovascular system, it increases the blood pressure to increase the rate of flow of oxygen throughout the body. Is this a positive or negative feed back? Cus i know that there are only 3 or 4 types of positive feedbacks and this is not oe of it. If it is negative how so> Because it looks like the the response is magnified with the continous stimulus. Pls explain. Thanks.
Bryan MB (1 год назад)
You have no idea how much this has helped me. Thank you so so much.
Edris Alkozi (1 год назад)
KA is always is the best.
Shay Jones (4 месяца назад)
Followed most of the recommendations in this blood pressure level solution “fetching komso site” (Google it) for 30 days and a half. I am obese, diabetic person with Stage II Diabetes, and also have high blood pressure. I needed to pass the exam for D.O.T. Physical. I lost Thirteen lbs, my Blood pressure went from average of 155 to 136. I keep an eye on my blood sugar levels and it is now 125-130 when compared to the last time which was always somewhere in the 160s.
Shailesh Lohani (1 год назад)
isn't it via NTS in medulla? u said midbrain
DR SULTAN SAUDAGAR (1 год назад)
u said sympathetics increase the blood flow in not just the heart but all over the body(.but it does not increase the blood flow to cerebrum ) except it This is awesome video.
Hunter Benn (1 год назад)
Awesome explanation. Thank you so much!
Jordan Griffiths (1 год назад)
Vasodilation is caused by a lower action potention of the SNS not the PNS. When vasodilation is needed in order to reduce resistance such as when BP is high, the SNS begins to send less signals, thus begining to relax the smooth muscles of the arterioles (tunica media). This is turn makes the lumen wider (dilated) leading to reduced resistance and hopefully a decrease in blood pressure (BP). Great video, very easy to understand
Muhammad Irfan (1 год назад)
5% (1 год назад)
RIGHT AND LEFT SUBCALVIAN ARTERY, the left comes directly from the arch or aorta and the right arise from the barachiocephalic artery :)
Michaela Hattoy (1 год назад)
This is awesome, thank you!
Beela Hafeez (1 год назад)
there is nothing called left brachial artery! I won't continue the video
basic medical digest concept (1 год назад)
Margarett Fortaleza (1 год назад)
isn't the left subclavian artery the branch of the arch of the aorta and not the brachial artery?
Tamara Tamara (1 год назад)
Alaa A ..most welcome
Alaa A (1 год назад)
Tamara Tamara thank you for that!!
Tamara Tamara (1 год назад)
Margarett Fortaleza true! but when subclevian artery enters the upper arm it becomes brachial atery so it isn't a big mistake I think.
Rachael M (1 год назад)
Hey, thanks for the video - I did notice an error around the 9:30 mark. Sympathetic increases HR, SV & TPR. However, parasympathetics only have an effect on decreasing HR (their effect on decreasing SV is indirect, and they do not affect TPR at all). Wanted to point this out as it is important to understand! Cheers
Jennifer Ayaaba (1 год назад)
very clear explanation.thank you
Paula S (2 года назад)
Amazing!! Thank you.
Mark HABERKORN (2 года назад)
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Row S (2 года назад)
Thank you so much for this demo. I am studying Paramedical Science and this was spot on! This really helped me understand Baroreceptors in maintaining BP. Thanks heaps!
Wesley Adams (2 года назад)
The brachiocephalic artery is the first branch on the ascending aorta, not the right subclavian and the righr common carotid. Although they branch from the brachiocephalic artery, it is important to clarify that arterial trunk.
Maha Hamed (2 года назад)
GENERALLY, there is no parasympathetic innervation to the blood vessels
MilzTv (2 года назад)
I think you mistook subclavian artery for brachial. Brachial artery is a branch of axillary artery which is a branch of subclavian
rafal al-hilaly (2 года назад)
thank u !
Abdulrakib Kayad (2 года назад)
Great teachings, but if you can use legit markings in terms of numbers (ex. the amount of Action Potentials transmitted) instead of a random estimation that would really help out. Thank you for your consideration.
Fritz Pognon (2 года назад)
Well understanding
ngoc pham (2 года назад)
parasympathetic can decrease the Stroke Volume? according to what i have been told, it is only sympathetic devision can actually decrease or increase the stroke volume!
DroppedMyCroissant (1 год назад)
Jack Banister you're both right. There's a mistake in the video: Parasympathetic nerves only innervate the pacemaker cells, so they can modulate HR, but not SV or TPR directly.
ngoc pham (2 года назад)
+Jack Banister uhmm....i am not sure either. But it could be because parasympathetic stimulation has an inhibitory influence on the heart rate, so it would be more likely to decrease the Stoke Volume. Idk, i just thought there is a relationship between those, but i could be wrong! :)
Jack Banister (2 года назад)
+ngoc pham same here, I've also learned that parasympathetic innervation has no effect on stroke volume (ventricular contraction).
Thaon Simms (2 года назад)
The branches from the aorta should be subclavian instead of brachial
phoenix phoenix (2 года назад)
In 1st dia. 1st branch shud be left not right.
empress202 (2 года назад)
So clear and understandable. Thanks!
Karen Taijeron (2 года назад)
good lecture... thanks.. I learn something.. hehe
luluskyblu (2 года назад)
Terry Keyes (2 года назад)
Thank you
Ruba Sarkez (2 года назад)
Great. well done khane ^^
Erica Smith (2 года назад)
coffee? anyone?
Fatwa Pranata (2 года назад)
+Nitin Dhakla for hypertension family, don't consume caffeine, it's dangerious
Nitin Dhakla (2 года назад)
I need coffee
Viviana Han (2 года назад)
I'm addicted to your videos...
Nelly Hoffman (2 года назад)
you are hot
Fatwa Pranata (2 года назад)
+Viviana Han damn, i addicted on your
michelle purple (2 года назад)
your voice is so relaxing i went to sleep lol that's a good thing bc i don't go to sleep on no one
I rap my home work Brakache (2 года назад)
Thank you Khaaaaaaaannnn!!
Tami (2 года назад)
You're saving my life, thank you so much!
Olayide Obe (3 года назад)
Really helpful. Well done
Olayide Obe (3 года назад)
Really helpful. Well done
Muhaimin Noor Azhar (3 года назад)
wonderful, thank you!
Aparna Sai (3 года назад)
blood pressure=c.o x peripheral resistance  c.o.= stroke volume  x heart rate
Anthony Ceballos (6 месяцев назад)
Aparna Sa stroke volume= esv-edv
Hamzah Mahmood (3 года назад)
Such a helpful video, never fails to broaden my understanding of topics i thought i would never get or had little knowledge on.. Great for exam prep!
Nidhi Seth (3 года назад)
shouldn't this be the L. Subclavian and Brachiocephalic artery when talking abt the arches... otherwise great video
xLee (3 года назад)
Vagus nerve does not end up in the midbrain, nor does glossopharyngeus nerve. Parasympathetics doesn't make blood vessels dilate. If the pressure is high the vasomotor center inhibits sympathetic system. Despite those the other parts are great. Thank you for illustrating and making things that we read easier to understand.
Zayn Malik (1 год назад)
Nilupul Han
xLee (3 года назад)
+Nilupul Han yes that is correct, but that has to do more with the regulation of blood flow than regulation of blood pressure. When the muscles are in rest, sympathetic system regulates the blood flow, while when we exercise blood flow is regulated through local regulation.
xLee (3 года назад)
+Syed Tameem Ul Hassan he(and I) was talking in general, not in specific cases, of course everything has an exception.
Nilupul Han (3 года назад)
+Jack L.Chen it may not play a role as important as adenosine, histamine, lactate, K+ etc. But that sympathetic cholinergic vasodialotor system do exsist. Cheers :)
Jack L.Chen (3 года назад)
+Nilupul Han Never heard about that before D: Is that system as important as local metabolites? K+, adenosin and nitric oxide?
Zeynep N. (3 года назад)
I wish that you were my physiology teacher :) Thank you very very much. I understood the issue completely. My lecture notes did not help me like you about this cardio-vascular system :D
PAWESOME (3 года назад)
Oh this helped me so much. Thank you physiology seems easier because of you :)
TheLynchexperience (3 года назад)
hey just wanted to say a huge thank you for the tutorials you've put up . Theyve been a massive help in grasping all the concepts.
Putri Gayatri (3 года назад)
Carotid sinus is actually a dillatation of the internal carotid artery (superior to the bifurcatio). Nice video tho. :)
Marie-Chantale Duron (3 года назад)
I love you ... Thanks ever so much.😘 Now I will definitely pass my exam !!!
Nana Mseth (3 года назад)
Wait..since when is the brachial artery becomes the branch of arch of aorta? That is totally wrong fact!
Jacob Ogle (3 года назад)
I think he meant left subclavian which turns into the axillary and eventually the brachial..
Vahid Tahmasbi (3 года назад)
Got a question if baroreceptors not doing their job for whatever reason , is there any way they can be manuplate to comply, this is one of the reason with Parkinson , MS and maybe alzheimer desease,  Maybe angioplasty ! 
عمر سمارة (3 года назад)
Thank you very much
Rimsha Rims (4 года назад)
And what are volume receptors.. nd thanks great teacher u r..
kelly spencer (4 года назад)
Your videos are really great, thank you.
carolinespec (4 года назад)
Greatest video!  First of all, your voice is always so enthusastic that it is a pleasure to listen to all of your videos.  And second of all, I could never figure out exactly what they were talking about when books mention, but do not really explain baroreceptors.  I LOVE how you related everything to the formula--now vasoconstriction, dilation, and the action of aortic and carotid  bodies makes TOTAL SENSE.  THANK YOU!!!
elizabeth winship (4 года назад)
why do you have the glossopharyngeal and vagus nerve going to the mid-brain when it goes to the medulla oblongata please? coz it's confusing me, thanks :)
Mike Andresen (4 года назад)
There are several important inaccuracies in this twelve minutes including the parasympathetic dilation and the fact that the brain area is primarily the brainstem not the "midbrain". This reflex arc changes heart rate on a beat to beat basis so that baroreceptors firing 20 or 30 times per minute would be useless - the actual number is closer to 50 action potentials per second. Sadly the facts are lost on the general public as long as it seems correct. The number of folks congratulating this video for its "knowledge" speaks loudly of quality control. Really a pity that this is what passes for education.
Mike Andresen (3 года назад)
Well that is certainly the better way but information is being monetized and could well afford to be vetted. Too many unquestioningly believe wiki sites and Kahn Academy as authoritative but at best they are inconsistent. Caveat Emptor.
Gaël Batailde (3 года назад)
I'm studying to become a doctor and I use this as an extra studying method, if something isn't 100% clear, I turn to youtube but I do realise there are some inaccurate stuff, so my course notes are still the facts I trust and focus on.
Mike Andresen (3 года назад)
The trouble with such a sentiment about YouTube misinformation is that it suggests that facts are not as important as a slick presentation. Misrepresentation presents a huge challenge to the general public and contrary to the sentiment you state - indeed unvetted material like this is being used as fact by medical students being trained and presented by posting it, Kahn Academy represents it as accurate. Midbrain and brainstem are different parts of the nervous system. This is like making the case that 2+2 is approximately 5. It does matter and other unevaluated material placed on the web produces a haze of misinformation that you or iPhone-enabled practioners may use to make decisions. Facts and accuracy do count.
Joe Sef R. (3 года назад)
+Mike Andresen Most of the people watching this aren't training to be doctors, he still gave me a good general understanding of the key concepts so I'm thankful.
Decay is headed your way! (4 года назад)
Great lesson, but lousy image setting.  360 is low.  Needs to be at least 720 please
MrsJannethRocks (4 года назад)
Thanx Rishi for taking the time to share your knowledge with us!!!
snijana kz (4 года назад)
i like this video so much!
Mohammad Bakri (4 года назад)
This video is awesome .. but there is something wrong .. The parasympathetic NS Doesn't have a role in Blood vessels dilation ! instead, what causes vasodilation is the INHIBITION of the sympathetic NS.. isn't it? Thanks a lot :)
Double Trouble (2 месяца назад)
Mohammad Bakri Thx for pointing that out! :)
Qanoon madni (11 месяцев назад)
Baroreceptor r sphygmomanometer m kia difference ha plz.
Zayn Malik (1 год назад)
kylehallas2011 (4 года назад)
The PNS doesn't inhibit the SNS, it simply overpowers it, it releases acetylcholine to the smooth muscle causing them to vasodilate
Locelle Malapitan (4 года назад)
Also believe that the parasympathetic nervous system provides no innervation to blood vessels. So less sympathetic activity will dilate the vessels and lose some of its tone. Likewise an increase in sympathetic activity will increase the tone and cause vasoconstriction. Good Video to clear out the cobwebs though. 
SDGLifter (4 года назад)
You are an excellent teacher. Thank you for taking the time to share knowledge with us.
SamsReality (4 года назад)
Maybe be more careful with your drawings? (Even though I know it's just a sketch) The aorta originates on the left part of the heart. You forgot to mention the Truncus brachiochephalicus. The Brachial-Artery is not a branch of the Aorta, the branch you mistakenly named A. brachialis is the A. subclavia.
Shahad Shosho (4 года назад)
very helpful (y)
Carolina Garcia (4 года назад)
thank you!
Ousama Kay (4 года назад)
Magdalene Caryn Roberson (4 года назад)
It still surprise me, just how some people don't know about Hibloderox Remedy (just google it), although many people completely cure their hypertension naturally with this remedy. Thanks to my work buddy who told me about Hibloderox Remedy, I finally eliminated my pain & embarrassment for good with natural ways.
Kovács Anett (4 года назад)
thank you ever so much, its amazing!
Harold Gomez (4 года назад)
Great video! My only concern is with the part with the parasympathetic nervous system affecting the radius of vessels. The parasympathetic nervous system does not innervate vessels and therefore does not decreases the radius of the vessels. The only exception is some glands and the reproductive organs. Thank you!
perla lopez (5 лет назад)
Thank you !!!!! :D i get it now
Lanna S (5 лет назад)
Thank you so much, my friend introduced me to your videos when i was in high school and now i'm in university still using your videos. they are so helpful and i hate to admit this but they are perfect for last minute studies cause they just summarise everything so perfectly. you are honestly a life saver! I tutor kids as well, so i always show them your videos and share these <3 keep doing what you are doing, these videos are amazing
jwehilani (5 лет назад)
Thanks for the video!!! However, it's blurry to watch.
alethea Bernard (5 лет назад)
Excellent lecture. Neat, colorful and concise.
D Breg (5 лет назад)
that was so awesome! it is was really clear, concise and easy to follow thanks!
bustedstuff215 (5 лет назад)
There is no left brachiocephalic artery, and on the right it's the brachiocephalic trunk which branches into the right common carotid and the right subclavian. There's a lot of mistakes in this...be careful.
kirihitiana (5 лет назад)
My teachers stressed today that the parasympathetic NS only affects the heart frequency, not the contractility. Is that correct?
Idan Korenblum (5 лет назад)
what software are you using?
JODI (5 лет назад)
Very helpful , thank u so much..
John Drazan (5 лет назад)
Great video as usual, one question. I thought that the ventricles only had sympathetic innervation, if that is true how does a parasympathetic response effect stroke volume? Thanks!
paskiewaskie (5 лет назад)
you are amazing!! these videos are so helpful!
Abdullah Khubrani (5 лет назад)
Thank you very much ,, really it is helpful
Edward Mulvey (5 лет назад)
Thanks Rishi. I am a first year med student in Australia. Your videos make tricky concepts super easy to understand. Please keep it up. You're awesome.
caliway76 (5 лет назад)
Very helpful, thank you so much!
megustamango (5 лет назад)
Is it true that parasympathetic do not play a role in vasodilation; rather vasodilation is due to inhibition of sympathetic via inhibition of cardiac-activating center and/or vasomotor centers?
IAMsangoku (5 лет назад)
clearly explained. awesome!
ImGonnaFailExam (5 лет назад)
Plz let me hug you...
khanacademymedicine (5 лет назад)
Absolutely! If you find these videos helpful, please spread the word! =)
khanacademymedicine (5 лет назад)
Low BP is detected by baroreceptors and the reflex loop is to increase sympathetic output to the heart.
khanacademymedicine (5 лет назад)
Baroreceptors rapidly adjust your BP. Chemoreceptors rapidly adjust your ventilation (both are pretty fast). Those are the primary roles of the two systems. However, you're right to point out that chemoreceptors have cardiovascular effects as well and the brain basically takes input about blood pressure (baroreceptors) and composition (chemoreceptors) when "deciding" on the correct sympathetic/parasympathetic balance for the heart.
s2srea (5 лет назад)
This is awesome- Thank you!

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