Its actually simple...at low volumes of lungs (e.g expiration ),suractant becomes concentrentrated ->surface tnsion decreases->collapsing pressure decreases(acc to laplace law)->compliance increase ..that's why we say that compliance is greater at lower volumes ...vice versa happens during inspiration I.e volume increases ->surfactant concentration decrease ->surface tension increase ->collapsing pressure increase->compliance decrease ...thats whycompliance at higher volumes is less...this is the basis of hysteresis...dont know why people make this simple concept so difficult to understand..its simple physics
Not everyone has a brain for physics, and sometimes simple concepts are explained in confusing ways by lecturers, thank you for the note about volume and surface tension, it will be even more clearer to say surface area, when surface area is reduced , action of surfactant will be stronger, thank youuuu
This is such a good series. Can I ask that you produce a side series explaining surface tension and surfactant and hysteresis further? It’s always brushed over in medical school. Thanks
hysteresis of the lung is one of the most astounding findings that we made about physiology and represents how simple nature is when it faces complex problems.
Yes, yes, all very astounding, but WHY is there hysteresis? WHY is compliance greater during expiration?? Based on result of the saline expts it must have to do with surface tension but HOW? You say it's "simple," but I don't see it, and the damn video sure didn't bother to say anything about it.
collapse of lower resp tract deficient in cartilage and less smooth muscle leads to air trapping beyound closing capacity and hence prevent total collapse of the Lung, I suppose.
Its actually simple...at low volumes of lungs (e.g expiration ),suractant becomes concentrentrated ->surface tnsion decreases->collapsing pressure decreases(acc to laplace law)->compliance increase ..that's why we say that compliance is greater at lower volumes ...vice versa happens during inspiration I.e volume increases ->surfactant concentration decrease ->surface tension increase ->collapsing pressure increase->compliance decrease ...thats whycompliance at higher volumes is less...this is the basis of hysteresis...dont know why people make this simple concept so difficult to understand..its simple physics
Not everyone has a brain for physics, and sometimes simple concepts are explained in confusing ways by lecturers, thank you for the note about volume and surface tension, it will be even more clearer to say surface area, when surface area is reduced , action of surfactant will be stronger, thank youuuu
Thank you so much, came here to resolve exactly this doubt i had
The question I had is, for a same volume of lung why compliance differ between inspiration and expiration
the comparative loop of air filled and saline filled greatly added to the ease of understanding pr- volume loop and lung compliance
You deserve to be known.💜 the best video I found in this topic And the easiest to understand
This was fantastic! Thanks!
love it... thank you
Thank you so much!!! This was very helpful :)
I just found a golden content
really nice video : )
This is such a good series. Can I ask that you produce a side series explaining surface tension and surfactant and hysteresis further?
It’s always brushed over in medical school. Thanks
Indeed a great teacher
hysteresis of the lung is one of the most astounding findings that we made about physiology and represents how simple nature is when it faces complex problems.
Yes, yes, all very astounding, but WHY is there hysteresis? WHY is compliance greater during expiration?? Based on result of the saline expts it must have to do with surface tension but HOW? You say it's "simple," but I don't see it, and the damn video sure didn't bother to say anything about it.
Please upload a class on Krebs cycle, ATP production and C3,C4 plants
💯
What role has the closing capacity have on stopping lung collapsing (residual volume) vs it's high compliance at the end of expiration?
collapse of lower resp tract deficient in cartilage and less smooth muscle leads to air trapping beyound closing capacity and hence prevent total collapse of the Lung, I suppose.
your voice is similar to Piers Morgan Lol