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physio Q - amin92
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06-04-2007, 11:08 AM
A 23 yr old man has ICF 28L , ECF 14L, PLasma Vol 3L and ECF osmolarity 285mosm/L. The man drinks 3L of water and consumes 10mEq of Sodium (in the form of potato chips). What is his approx ECF osmolarity ?
A 266, B 285, C 291, D 300, E Cannot be determined
06-05-2007, 12:21 AM
this man drinks 3l of water with only 10meq of Nacl ( hyposmotic fluid) so the osmolarity should be less than initial osmolarity ( 285 in this case)...the only possible answer here is...A...
06-05-2007, 12:23 AM
hmmm thats the way to look at it... i'm not great with calculations, but this way would have made sense.....
06-05-2007, 12:33 AM
yes that it is an easy way but there is an other possibility to resolve this Q.
total number of OSm ( before drinking water) = (28+14)* 285= 11970 and after drinking 3l of water ( 42+3) = 45....the osmolarity increase by 10 meq....= 11970+10= 11980 so the concentration = 11980/45= 266... hope this helps...
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