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Old 05-03-2013
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Question Lung and Arterial Compliance and Elasticity!

can u please elaborate n make my concept more clear by explaining two statements as below

a) pulmonary compliance increases with advancing age as elasticity decreases with age

b) arterial compliance decreases with age becoming stiff thus their elasticity increase with age?

kindly comment briefly on statement b as if pulmonary n arterial compliances are different things
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Old 05-03-2013
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First of all know that elasticity is ability for the tissue to recoil back after stretch. So tissue that recoil back easily after stretch have higher elasticity. Elasticity is inversely related to compliance.
A. As we age we predispose lung to fibrosis be it from life style; smoking or infection. A fibrous lung is so stiff and cannot recoil easily when stretched making elasticity low so compliance increases.

B. yes that is true. in the arteries elasticity is due to muscular strength so arteries have higher elasticity than veins. If u compare adult arteries to a child's artery which one would have more muscle or muscles well developed? Obviously the adult. so adult artery can recoil faster or higher when stretched so have higher elasticity and so lower compliance.

This is how I understand it. Hope it helps.
In USMLE, “Any fool can know. The point is to understand.”
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DR.PRO (05-03-2013), sohaibamjad (05-04-2013)



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