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NBME#2 block 1 Q1-----------Q50 - maryam2009
#91
drona99 - 03/11/11 15:57

37= by exclusion EE
a-increase in airway resistance - decreases expiratory flow rate -eg-asthma
b- surfactant no role in expiratory flow rate
3-cilliary beating frequency -no role on exp flow rate
4-expiration is passive
f-increase in parasympathetic-brochoconstriction so decrease in flow rate.
Nymore addition?

nice scheme to answer the question... i had it wrong because increased expiratory effort by conracting accessory muscles like intercostal muscles and neck muscle increases intrapleural; pressure thus increase expiratory flow rate.... However, I did not know that this is not the case always cuz as the lung shrinks during expiration and the higher the intrapleural pressure by the increassed expiratory effort the more pressure on the airways will be excerted and the higher he resistance.

because the lung in the question was at it is 25% lung volume

http://books.google.com.ly/books?id=7Rix...ve&f=false
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#92
drona99 - 03/12/11 00:09

50- indirectly asking abt neutrophill chemotactic factor
so Cc
Chemotactic mediators bind to neutrophil receptors.
Mediators include C5a, LTB4, bacterial products, and IL-8.


I got it wrong cuz I got confused between whether COX gave LKT or PGs in addition I didnt know 5HPETES
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