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Comments ...

 +12  (nbme21#25)

Water(1) 1Kg water=1L water 450mOsm/kg water=450mOsm/L water Min H2O needed to dissolve 450 solute by kidney is 1L water Water(2) Other (feces et al.)=1L Total: water(1)+ water(2)=2L

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submitted by nwinkelmann(260),
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h89g@8 esa"Buce eth uoconstirbt is bvaoe eth vaeallro inegros teher is a rcseeeda ni ari ,flwo not ugnl ulsveo,m hcwhi lwoud akme sthi na tsvtboeuric o"hoyltapg is teh smot upllefh e.ltixoanpna fI oyu ownk hte stmo baisc hdoypitsinletinyhpoaofigo/ of tetscrbuvoi vs itcveerstir h(cwih I d,o jsut itdd'n ni taht somt fldimipsie aw,)y hnet yuo nac uirfge nantyhig uto. If eisothmng is ignitcmpa riaawy lofw = t,vtsbcrouie if iosnhmteg is tagiincmp awairy elvumo = ee.ircistvrt TKHNA !UOY

burningmoon  How about emphysema? airway volume changed but it's obstructive. +2  
almondbreeze  i think OP meant to say that something DECREASING airway volume = restrictive +3  
jgraham3  I think they mean if something is impacting LUNG volume (ie. expansion/compliance) = restrictive Airway disorder --> obs. / Parenchymal disorder --> res. With emphysema the airway collapses (obs.) before they are able to exhale fully thus the air is trapped +  
dna_at  Just to be clear, this is not a classical obstructive lung disease affecting the small airways, as it is above the carina (trachea). This is better classified as a fixed upper airway obstruction. See the flow loop here for "fixed obstruction" - it came up in IMED UWorld so maybe familiarize yourself with the image since it is unique! +2