Baroreceptor reflex anatomy

Baroreceptors in the carotid sinus and aortic arch send information about blood pressure to the brainstem, and reflexes here drive changes in sympathetic and parasympathetic innervation to the heart and peripheral circulation. But what does all of this mean?
Music:
Under The Tide by Gregory David
www.epidemicso...

[@alanwaterman1328]

Sam Webster can make any anatomy topic fun, vivid and exciting. Well done.

[@Lilym661]

Just had a thought, isn’t it incredible that even the thickest dense example of the human race, contains this huge sophisticated machine with no need to give it a minute’s attention. Wow.

[@smadaf]

There are very few persons whose KZbin videos I know I can give a thumbs up to before I even begin watching them. Sam Webster is one of them.

[@sonjagatto9981]

I understand and even though I rarely comment ... always thumbs up first. 👍☺

[@evangelos_tziniolis]

Your approach to teaching and explaining is so good that made me stick around. I am not a student or anything related to anatomy, biology or medicine but I found very interesting things here. Thank you very much, sir!

[@StephEdwardsNaturalTherapist]

OMG thank you for this . Just what I needed to know for my pt.

[@mountainmolerat]

Super interesting and well explained. Thank you.

[@Lolittaaa9304]

Thank you Doctor Sam!!

[@AngDevigne]

Thank you!! This makes dysautonomia and POTS make so much more sense!!

[@vsrump]

would you consider making a video about the receptors of a woman’s cervix which can cause “vaso-vagal response” when the cervix is stimulated by , for example, pain , dilatation, IUD insertion ,heavy bleeding with clots …..all can cause her to become light-headed and/or experience syncope….. many women are not aware of this phenomenon….or am I mistaken ?

[@Lilym661]

Now that’s an understatement,there are lots of words.

[@Amira_Nabil_]

Excellent 👏👏👏

[@sohammisal5418]

Great Explanation ...very helpful 👍🏻☺️💯

[@nailcanozturk1491]

Dear Sam, thanks. This is Nail from Turkey, we shortly met in Prag..

[@sonjagatto9981]

That would have been very special.👍👍

[@SamWebster]

Hi again!

[@missyora5364]

Hi, thank you for sharing, can you tell us the link to the 🫁 lung model and background body model please? Thank you. I can’t find them anywhere. I have a Skelton, but your models are in depth. Thank you in advance

[@sonjagatto9981]

Awesome as always. Vielen Dank❣

[@umdolofia]

Another excellent video. A few small concerns, however: a) You talk of (venous) blood moving down into the legs as you stand. How is this possible, given the valves in the venous tree? b) You describe the heart sucking blood up a column (extending from the heart down to the feet) Since fluids actually move from high to low pressure rather than being ‘sucked’, is this idea of the heart ‘working against a column of blood’ (from the top rather than the bottom) correct from a mechanical point of view?

[@suzvera5425]

Is there a similar a long the phrenic nerve for the functioning of the diaphragm?

[@ruggerogabbrielli6831]

In a closed circuit, for every tract carrying blood upwards there would be one carrying the same amount of blood downwards. How would the heart have to work harder when you are standing compared to when you are sitting then?

[@alotofjobs4276]

It started about 4 months ago when I came home from school I had this headache and I didn’t think anything of it but it suddenly got worse and it made my neck stiff and nausicous and we kept going in and out of the hospital for a few days until it finally got better but I started to notice after the time I got better I was having difficulty with speaking which has gotten completely better but I feel lightheaded when I stand since then and have vision loss and this has not gotten better really at all

[@Mehraj052]

Sir, I have a question... "All reflex actions are involuntary in nature but all involuntary actions are not reflexes". Is it correct? When does an 'involuntary' action become a 'reflex' action? Hope you mention it in your upcoming videos as well!!

[@SamWebster]

The definition is good but can be confusing. A deep tendon reflex (tap the patellar tendon and the knee extends reflexively) consists of neurones that are connected in the spinal cord and trigger each other to do different things. Your voluntary centres in your brain can over-ride this reflex and you can stop it from happening. This is an involuntary reflex that you can voluntarily over-ride. Similarly there are reflexes that manage the rate and depth of breathing in response to pH or pCO2 in the blood or mechanoreceptors in the lungs. There are also centres in the brainstem that drive the movements of breathing continuously. You can over-ride the actions of these centres and reflexes to a point (you can only hold your breath for so long before your reflexes will over-ride your concious control and insist that you take a breath). Breathing is an involuntary action that is not initiated by a reflex but is managed and fine-tuned by reflexes. The vestibulo-ocular reflex is a reflex that moves the eyes in relation to movements of the head to stabilise vision. Saccadic eye movements are not reflexes but are involuntary actions that move the eye so that the brain can build a picture of the world. It's not that an involuntary action becomes a reflex action, it's that these things have different structures (which you might think of as different programming). Bear in mind that the complexity is such that there are overlaps and blurring of definitions at times.

[@MdMillath-w7m]

Goat ronaldo

[@choykage26]

617k❤

[@CIA.Langley]

God is awesome!