Respiratory | External Respiration: Ventilation Perfusion Coupling
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- เผยแพร่เมื่อ 26 ก.ย. 2024
- Correction @27:50 , the ventilation INCREASES as we go down from the Apex to the Base, but the perfusion increases SIGNIFICANTLY more. Since Perfusion increases more than Ventilation as we move to the base of the lung, the V/Q ration decreases at the base
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At time 27:30, you said that ventilation decreases from apex to base, but actually it increases from apex to base of the lung. Perfusion also increases from apex to base, but much more significantly that we have a lower V/Q at the base.
but shouldnt air goes against the direction of the gravity?
@@caidenlu we are talking about ventilation here, not just air. Thanks for your input....
@@BlaackAnchorbut isn't ventilation the movement of air? but i get youre right, just still got confused here about why
@@BlaackAnchor is it because at the end of expiration, the FRC at the apex area is more than the bottom, so the ventilation at the apex is considered lower?
@@caidenlu The ventilation is low because the cross sectional area (surface area) is low in the apex of the lungs
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Point of correction- The lower zones of the lung ventilate better than the upper zones and the middle zones have
intermediate ventilation.
In addition ventilation perfusion ratio increases three times in the apex than in the base
But in that won't the v/q ratio be disturbed?Could u explain why u think ur point is right?
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Thanks you so much for the presentation on V/Q ratio .
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best videos ever - actually makes learning this stuff, dare I say, FUN?!
you give the human body it's proper dues! love your videos. big thank you!
Thank you so much for the video on V/Q. This is awesome.
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This was so perfect and helpful in every way! one of my favorite videos on TH-cam.
Hello u said that ventilation is better in the top(apex ) of the lung ,but actually it should be decreased bec all books said that lower zones of the lung ventilated better thant upper ,i wish u explain!! + ur the best in explaining physiology
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I feel like you should have emphasized that the smooth muscle in the arterioles contracts and relaxes because capillaries dont have smooth muscle and so the illustration can be misleading.
Elaborate
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There is an error: ventilation is higher at the base than at the apex because of increasing compliance.
The V/Q ratio is biggest at the apex because at the apex: Q higher is relatively to V.
V/Q ratio is lowest at the base because V is higher comparatively to Q.
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27:15 !Ventilation is higher at the base of the lungs (in an upright position) due to gravity pulling on lung tissue which increases pleural pressure!
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Glad you’re enjoying it! 😀
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28:00 . Isn’t Ventilation more at the base of the lung? Ref: Ganong’s
The ventilation being talked abt is in the alveoli and not outside the alveoli..the ventilation will be more at the base but that phenomenon is applicable to the outside of the alveoli
Ventilation and perfusion is higher at the base and lower at the apex of the lungs. However, V/Q ratio is higher at the apex and lower at the base.
Yes due to gravity
this doesnt make sense to me either
@@rachellugtu2776 if the perfusion is lowest at the apex then whould the apex of the lung not try and match the ventilation therefore at the top of the lung would have a high ventilation?
Sir, you teach us from the root of the topics that i love... Sir can u make a video on chest x-ray..there are many lectures on xray but all are boring....
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Thanks alot for making it easy to understand ...
Great job! Thanks
Good video pal. Very well explained. Thanks.
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Hey Zach, great video but wouldn't V AND Q be greater at the base compared to the apex (~28:00)? Pa > Pv > PA in Zone 3 so arteriolar perfusion pressure leads to good blood flow. For Ventilation, alveoli at the base have higher compliance and we would see an increase in ventilation for Zone 3 as well. Overall the the increase in Q > V so V/Q is decreased even though both are increased
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Hey thanks for this video could you please assist and create a video on how an incentive spirometer works to prevent atelectasis?
Great one.
Such a great effort Sir 🙌💯
Love your explanation 👏
i like the way u teach with ! thank u for helping us
amazingly helpful
At the end of the video you said that the ventilation in upper part will be higher than the lower part of lung but in real the ventilation also increases from upper lobe of lungs to lower not so intensively as the perfusion but it does increases
This helped me so much !! Thank you.
Thanks ❤
Ventilation increases from apex to the base. Please correct it ! Other than that ! A big fan ! Great job zack !
Excellent
amazing explanation thanks a lot!
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Amazing info and amazingly to taught...
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That last part regarding the varying V/Q ratio due to gravity is troubling me..here's my doubt.
A few minutes ago we learnt that the poor perfusion thing leads to poor ventilation too.
Then how can the perfusion and ventilation be the opposite here in this scenario?
If someone gets the question and proper explanation to my doubt...please do reply.That means a lot to me.
Thanks.
This is because, decrease in blood flow to alveolus decreases both oxygen and carbon dioxide Diffusion.
Consequently, partial pressure of oxygen will increase while partial pressure of carbon dioxide deceases.
Decrease partial pressure of carbon dioxide stimulates bronchioles smooth muscle to contact.
This reduces oxygen wastage as it is churned into well perfused alveolus.
In addition it reduces carbon dioxide expiration.
Hence maintaining Normal ventilation ratio
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