physio Q - amin92

[ArchivalUser]

As part of an experimental study, a volunteer agrees to have 10
grams of mannitol injected intravenously. After sufficient time for
equilibration, blood is drawn and the concentration of mannitol in
the plasma is found to be 65 mg/100 mL. Urinalysis reveals that
10% of the mannitol had been excreted into the urine during this
time period. What is the approximate extracellular fluid volume of
this volunteer?
A. 10 L
B. 14 L
C. 22 L
D. 30 L
E. 42 L

[ArchivalUser]

B. 14 L

[ArchivalUser]

14

[ArchivalUser]

B is Correct....)
Mannitol is a marker substance for ECf, ECF = amount of mannitol/ Concentration = 10-1/O.65=13.84