Guyton and Hall Medical Physiology (Chapter 18)REVIEW Acute Control of Blood Pressure || Study This!

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Thank you Cole, that makes it all worth it!

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[@StudyThis]

Thank you! Appreciate the feedback

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Thanks Nafis!

[@leosauvant2758]

In 1:05 you were saying that parasympathetic stimulation would dilate blood vessels but I can't find that information in the chapter. Instead it says that parasympathetic stimulation mainly acts on the heart regarding circulatory effects. I think so far I've only heard that inhibition of the sympathetic system causes vasodilation not parasympathetic stimulation. Maybe I've missed something, looking forward for an answer!

[@StudyThis]

It is a little confusing, but think of inhibition of one system (sympathetic) allows for stimulation from the other system (parasympathetic) to cause the opposite reaction/response.

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Keep it up, it is very helpful for revisions for exams!

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[@aravindkumar3846]

Brilliant. Can u do this with harper as well

[@blopblop762]

How come at the oxygen demand theory you mentioned that O2 decrease causes local vasodilation , but at the chemoreceptor part which senses O2 decrease , now its causing vasoconstricion ?

[@StudyThis]

Good question; They are two different homeostatic mechanisms. The oxygen demand theory is for local blood flow control to a specific tissue - so if that tissue is hypoxic, it needs more oxygen so the blood vessels respond by vasodilating. The chemoreceptors are trying to regulate essentially total blood pressure - so hypoxia sensed by a chemoreceptor (or hypercapnia/acidemia) indicates systemic hypotension so one of the responses is to increase systemic vascular resistance (vasoconstriction, in addition to increased HR and contractility) to increase blood pressure.

[@sahilhusaini3160]

Thank you soo much it was very helpful but can you plz say some more details for the next videos

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[@sahilchoudhary1305]

i really really love your channel helps me out tons.... but i would like you to if possible, just to explain a bit in detail

[@StudyThis]

Thanks for the feedback Sahil!

[@TheCardioGuy]

Great :)

[@thegreatgamers6298]

you missed a lot o important thing but otherwise good lecture