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Discussion in 'NBDE Exams & Licensure Exams' started by mission dds, May 10, 2007.
can anyone plz explain me the relationship between lung compliance and lung recoil.thanks in advance
recoil is d force to expel air from lung.and compliance is lung capacity for air volume.more compliance needs larger recoil to expel out large volume of air.okie.
thanks a lot
recoil and compliance are a bit difficult to grasp, But Ill try to explain
Compliance : The ease of distensibility of lungs with an increase of air pressure entering the lung . (it is not the distensibility itself). Say u increase the pressure in 2 different lungs by 1mm of hg , 1 lung expands by 10ml (more compliant) and teh other by 5 ml (less compliant)
Interplural pressure : The -ve pressure in the thin film of "plural fluid" bw chest wall and the lung ( THIS KEEPS THE LUNG INFLATED and i given a ngtive value as there is a partial vaccume in the thorasic cavity )
Recoil : The force that tries to "collapse" the lungs (OPPOSES INTERPLEURAL PRESSURE and thus has a positive value) And is contributed by elastic property of collage and elastin in the lung (alpha-antitrypsin deficiency targets this property)
Relation b/w compliance and recoil : The more force that pulls lungs inwards (recoil) the harder it is to expand/distend the lungs , Therefore the LESS is the compliance and vice versa .
SO in a nutshell " recoil and interpleural pressure are opposite forces of deflation and inflation respectively , and the interplay b/w them determines the lung compliance ( easy of inflation)
good luck with that
That is the right explanation.
pretty good explanation of lung mechanics...now let's see some differential equations, haha
thanks a ton for the explanation.
You are most welcome sir/madame !