DrVirgo
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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
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| DrVirgo
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Answer: A
Can anyone explain?
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| ralux
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Na intake is not a segnificant one (the concentration of Na in ECF is 150mEq, and he only consumes 10mEq).So he drinks a hypotonic fluid, which will decrease his ECF osmolarity.And the only answer which has lower value than 285, is 266 (A)
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| robin082006
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| dandrof
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i think u r right ralux ... but i wonder if there is any equation that correlate the values of SODIUM with water intake , i means taking each one alone
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| ralux
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it is..its about the number of miliosmols of the body....i remember i saw this question someplace else..i just dont remember where ...and i didnt pay attention on the calculation part(unfortunately)....so i dont know how to do it..
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| robin082006
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before drinking water: total number of osmol = 285*42=11970
After drinking water: total number of osmol = 11970+10=11980, volume=42+3=45, so concentration = 11980/45=266.22
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