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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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.
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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.
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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
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
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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.
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.
+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! :)
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.
+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.
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 !
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!!!
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.
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.
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.
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.
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 :)
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.
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.
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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!
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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.
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.
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