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

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.
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[@rachaelm1021]

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

[@vaybtv3743]

The 4BloodPressureRemedy.blogspot.com has helped me to reduce my blood pressure (accurately 20-point cut) for 2 weeks only of utilizing it. Nevertheless, you need to exercise for about THIRTY-FIVE minutes daily. The feeling I have now is overwhelmingly content simply because my blood pressure is under the border line. .

[@ronnynoneofyourbusinessgoo7892]

You 4 above are all nuts. As to what you are saying, that's correct sort of, parasympathetics don't input on actual blood vessels, so they don't affect TPR that way. However, they do input on sympathetics and thereby CAN inhibit them and thus lead to vasodilation by inhibiting sympathetic drive, I am pretty sure.

[@blackyrocky7438]

What is heart rate? How we consider it important? What it represents?

[@macroftStudio]

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.

[@syedtameemulhassan5772]

Indeed parasympathetic has a little effect on blood vessels of Penis... ?? It causes erection... :)

[@nilupul014]

TRUE! But don't forget the sympathetic cholinergic vasodilator system seen in the resistance vessels in the skeletal muscles. Awesome video!

[@nilupul014]

And... the 11 people who didn't like this video..why don't u do one on this topic n post it for us to see? :-)

[@JackLChen]

+Nilupul Han Never heard about that before D: Is that system as important as local metabolites? K+, adenosin and nitric oxide?

[@nilupul014]

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 :)

[@khanacademymedicine]

Absolutely! If you find these videos helpful, please spread the word! =)

[@rowenas709]

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!

[@SDGLifter]

You are an excellent teacher. Thank you for taking the time to share knowledge with us.

[@khanacademymedicine]

Low BP is detected by baroreceptors and the reflex loop is to increase sympathetic output to the heart.

[@jyotikaprabhu4434]

baroreceptors gets activated during high BP n activates NTS centre in medulla which leads to decrease in BP

[@TheLynchexperience]

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.

[@h4mz4hm4hm00d]

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!

[@carolinespec]

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!!!

[@empress202]

So clear and understandable. Thanks!

[@milz2327]

I think you mistook subclavian artery for brachial. Brachial artery is a branch of axillary artery which is a branch of subclavian

[@pawesome1458]

Oh this helped me so much. Thank you physiology seems easier because of you :)

[@khanacademymedicine]

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]

This is awesome- Thank you!

[@paulaswitzer2095]

Amazing!! Thank you.

[@sh.m3668]

One of the best explanations I found on youtube! Thank you

[@MrsJannethRocks]

Thanx Rishi for taking the time to share your knowledge with us!!!

[@xBryanPearx]

You have no idea how much this has helped me. Thank you so so much.

[@snijanakz30]

i like this video so much!

[@marchgirl9727]

This is awesome, thank you!

[@dbreg1710]

that was so awesome! it is was really clear, concise and easy to follow thanks!

[@hunterbenn7044]

Awesome explanation. Thank you so much!

[@mynnzero]

wonderful, thank you!

[@elizabethomara9007]

This is the best explanation I have found. Thank you!

[@zemasound5948]

thank you man!! the way you explained this was amazing!!

[@jenniferayaaba4146]

very clear explanation.thank you

[@cyntiasianturi9007]

Love this vid! Thanks a lot!

[@kreo971]

I love you ... Thanks ever so much.😘 Now I will definitely pass my exam !!!

[@IAMsangoku]

clearly explained. awesome!

[@summersetsmith]

thank you ever so much, its amazing!

[@blancaramos8902]

THANKKKKKKK YOU! finally found a video that explains it well!

[@CristianoRaashid77]

I just realized cardiac out output and flow is the same. Thank youuuuuu

[@calistaviscomi]

Very helpful, thank you so much!

[@hannahwelsh9263]

So helpful and easy to follow, thank you

[@aletheabernard3980]

Excellent lecture. Neat, colorful and concise.

[@olayideobe78]

Really helpful. Well done

[@rahmaadel7772]

Excellent! Thank you

[@kellyspencervideo]

Your videos are really great, thank you.

[@gmaiaswbellnet]

Such an awesome exercise session.

[@kahwangwong3163]

love it man

[@princesssarahcontreras-gre3491]

very understandable, thank you

[@SunnyDay030]

Thank you so much for the video. I FINALLY understood. Thank you thank you. !!

[@pascalejosama]

you are amazing!! these videos are so helpful!

[@lardigmer]

thank you my friend :)

[@bsenr.22]

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

[@raphaelmaktv3828]

KHAN ACADEMY the best, respect though🙏

[@chisomeneje3996]

Very helpful

[@tamarah07]

Thank You!

[@Suhaiberomar]

Bro thank you for the illustrations ❤

[@jodi7417]

Very helpful , thank u so much..

[@DOAU]

**NOTE** There are ONLY sympathetic innervations going to the smooth muscles of arterioles to cause BOTH vasoconstriction & vasodilation. The medulla oblongata will send more sympathetic signals to vasoconstrict arterioles, and the medulla oblongata will send less sympathetic signals in order to vasodilate arterioles. There are NO parasympathetic innervations that affect arterioles. My source is my Human Physiology professor and Human Physiology book by Silverthorn.

[@rubasarkez9917]

Great. well done khane ^^

[@kanishkasingh4701]

Loved it! 💙

[@rimsharims345]

And what are volume receptors.. nd thanks great teacher u r..

[@zainabeid294]

I wanna say,the video was amazing and i didn’t fell the time when i was watching the video,thank youu very much🤍

[@luluskyblu]

THANK YOU!!

[@fritzpognon2641]

Well understanding

[@user-uq3tb1qe1h]

Thank you so much ❤️

[@88abo0od]

Thank you very much ,, really it is helpful

[@nahriisawesome]

You're saving my life, thank you so much!

[@croceye1910]

Yooo

[@Loraccc24]

thank you!

[@hellokitti1987]

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

[@RA-om8ck]

The 3rd branch of the aortic arch is the subclavian artery. The right subclavian branches off the brachiocephalic trunk. Great video overall, thank you!

[@rafalalhilaly7757]

thank u !

[@Prabhu21]

Great lecture

[@user-bg5hi9hf3q]

Thank you very much

[@kjfhgyur]

Thank you !!!!! :D i get it now

[@theladysilverwings]

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

[@terrykeyes1642]

Thank you

[@saadharoonraja1342]

Thank youuu king❤💯

[@lazanyaok]

awesome...:)

[@shahadshosho3695]

very helpful (y)

[@frogon1]

brilliant, thanks. have you done one on TBI autoregulation???

[@NIO_FLOFY177A]

good lecture... thanks.. I learn something.. hehe

[@locellemalapitan4616]

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.

[@babytiger2304]

I love how he did draw a heart with a heart💖 Cute😂💕

[@annieli3258]

Dr. Avery, is that you teaching us?

[@MrUrbanExp]

Great lesson, but lousy image setting. 360 is low. Needs to be at least 720 please

[@mohammadbakri7892]

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 :)

[@kylehallas2011]

The PNS doesn't inhibit the SNS, it simply overpowers it, it releases acetylcholine to the smooth muscle causing them to vasodilate

[@zaynmalik879]

kylehallas2011

[@qanoonmadni9752]

Baroreceptor r sphygmomanometer m kia difference ha plz.

[@swedensdoubletrouble]

Mohammad Bakri Thx for pointing that out! :)

[@maxh1964]

@@kylehallas2011 no actually the acetylcholine reduces the release of norepinephrine. neuropeptide y in contrast released from the sympathetic system inhibits the release of acetylcholine

[@mrekrahi]

We just learned about regulation of arterial pressure today. Our professor teaches from the BRS textbook. He told us that the parasympathetic autonomic nervous system does not affect blood vessels (i.e. arteries and veins), it only affects the heart. However Dr. Desai pointed out it does (10:12). Please help me out here... I am confused as to which one holds credible :(

[@AbdulAbdul-cm9em]

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.

[@edris.alkozi]

KA is always is the best.

[@moneyminds284]

8 years ago 😮 No wonder u have got million subscribers

[@Gtsbsr]

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!

[@farhadalam5906]

Now you are a doctor 😅

[@edwardmulvey18]

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.

[@matthewmiller4045]

are you a doctor now?

[@wamiqfarooq7401]

@@matthewmiller4045 haha

[@vivihan5021]

I'm addicted to your videos...

[@FatwaPranata]

+Viviana Han damn, i addicted on your

[@nid7]

shouldn't this be the L. Subclavian and Brachiocephalic artery when talking abt the arches... otherwise great video

[@shasha3690]

I came to the comments just to make sure it wasn’t just me

[@dragospop202]

Actually its the left subclavian and left carotide arteries

[@drkbsdiary5257]

good

[@comedy0stuff]

RIGHT AND LEFT SUBCALVIAN ARTERY, the left comes directly from the arch or aorta and the right arise from the barachiocephalic artery :)

[@drsultansaudagar2733]

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.

[@jaapvergouwen8914]

You're drawing the aorta attached to the right side of the heart?

[@thaonsimms]

The branches from the aorta should be subclavian instead of brachial

[@jwehilani]

Thanks for the video!!! However, it's blurry to watch.

[@johnvandenberg8883]

I think you also need to explain how this regulation mechanism relates to RAAS. Otherwise one might get the impression that the brain is the sole regulator of blood pressure, which obviously is not the case.

[@mahahamed3006]

GENERALLY, there is no parasympathetic innervation to the blood vessels

[@joseaparecidooliveira742]

Então para que a pressão arterial baixar eu teria que fazer o que?

[@EyeYannie]

thank you so much!!!!! this video saved me

[@gboyegaodutayo655]

EyeYannie

[@mikeandresen1316]

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.

[@joesefr.7756]

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.

[@mikeandresen1316]

The trouble with such a sentiment about KZbin 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.

[@gaelbatailde1141]

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.

[@mikeandresen1316]

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.

[@bhagyasilva4590]

Acording to Ganong's Carotid sinus is a small dilation of internal carotid artery, just above the bifurcation of common carotid. Bt u said that the sinus are located main carotid artery below bifurcation. What is the correct one? 🤔

[@JuhiMittal]

9 and 10 nerve end up in tractus solitarius which is actually in medulla oblongata (not midbrain).