Laplace Law | Respiratory system physiology mbbs 1st year lecture

[@saeedrahman3635]

This just made so much sense thank you so much! 🥺❤️
But isn’t the formula 2 x Tension x Thickness = Pressure x Radius?

[@PhysiologyOpen]

Yes...sometimes the thickness is considered negligible like in case of alveoli....for muscular walls we need to consider thickness as well

[@saeedrahman3635]

@@PhysiologyOpen ohh ok I thank you 😊

[@PhysiologyOpen]

Most welcome

[@ShobhaAdhikari]

amazing explanation! straightforward and understandable

[@PhysiologyOpen]

Thank you 😊❤️

[@mediquest7220]

Made concepts very clear! Thanks mam

[@PhysiologyOpen]

Pleasure as usual is mine

[@prarabdhasudame2039]

Maam why should we assume same tension in both alveoli why not same pressure as they are connected via air and not in a way so that the tension can be assumed equal ? I am really confused at this point 😅

[@yashikasolanki7817]

😮 amazing lecture mam thank you so much .

[@PhysiologyOpen]

Thank youuuu 😊

[@zeeshanzeeshan32]

Would be grateful if u answer.
If laplace law is applied to aneurysms, aneurysm ruptures because P>T owing to increased radius of anurysm .

[@PhysiologyOpen]

P= T/r - in aneurysms, radius increases - so this component T/r decreases - hence P is able to act on wall more . Moreover because of wall weakening, wall is not able to withstand that pressure

[@zeeshanzeeshan32]

@@PhysiologyOpen thankz maam

[@PhysiologyOpen]

@zeeshanzeeshan32 😊

[@vanshpersie07]

Thanks for the video ma’am doubts cleared before test 😁

[@PhysiologyOpen]

Great

[@Isagiyoichi911]

Thank you mam.Understood it properly

[@PhysiologyOpen]

Always love it when students understand the topic

[@vivekas.m9343]

Ma'am.
1)Is the Tension T that you've mentioned at first-Due to the water and P -due to air.
It is that tension which is counteracted by the surfactant?
2)How can we take T to be the same for both alveoli initially?

[@PhysiologyOpen]

1. Very good observation. Tension is due tendency to collapse...this creates pressure inside...but yes correct if no air is there...there will not be any pressure

[@PhysiologyOpen]

2. Again very good...tension is per cm of imaginary line..so small or big doesn’t matter

[@vivekas.m9343]

Thank you so much ma'am

[@PhysiologyOpen]

You are welcome

[@PhysiologyOpen]

My pleasure always

[@MounikaEslavath-c1y]

Thank you so much mam❤

[@PhysiologyOpen]

Most welcome

[@RubaAlbustanji]

Perfect 🩷🩷

[@PhysiologyOpen]

Thank you

[@vivekas.m9343]

Ma'am. I have 2 doubts
)Is the tension on the wall that you've described at first -The surface tension due to the water and P-due to air?!
The surface tension due to water is then counteracted by the surfactant?
2)How is that we can take the T to be same for both alveoli initially?
Thanks

[@shaileegohil9912]

We can't say surfactant counteracts but yes surfactant prevents the alveoli from collapsing.

[@nithinkrishna9861]

Thanks madam for the concept

[@PhysiologyOpen]

Always welcome

[@bhumikaale8977]

Thankyouuuu maam!!❤

[@PhysiologyOpen]

My pleasure

[@DOCoPedia-33]

Very much helpful thanks

[@PhysiologyOpen]

Glad it helped

[@mk-wb4yl]

Thank u very much mam💗

[@PhysiologyOpen]

My pleasure 😊

[@hananh23]

Is law of laplace applicable to alveolus?

[@hananh23]

…

[@hananh23]

Hey @physiology open, I am trying to link an article. My comment is getting deleted by youtube. Please check out this article - LAPLACE’S LAW AND THE ALVEOLUS: A MISCONCEPTION OF ANATOMY AND A MISAPPLICATION OF PHYSICS
By Henry D. Prange

[@PhysiologyOpen]

Yeah people have written that way that physics principles are not directly applied to physiology..that’s correct in one way …however sometimes it helps in simplifying complex physiology

[@PhysiologyOpen]

Yeah in one way

[@PhysiologyOpen]

?

[@kca7695]

Mam, does every alveolus has same amount of surfactant?

[@PhysiologyOpen]

for explaining Laplace law, we assume that

[@ayseyuce4124]

Thank you:)

[@PhysiologyOpen]

You are welcome

[@reenarenjit2360]

Not clear enough

[@PhysiologyOpen]

Whatdid you not understand ? any specific question?

[@nissahowny2825]

yea your accent.@@PhysiologyOpen

[@PhysiologyOpen]

@nissahowny2825 you from where?