A blood sample is taken from an individual whose blood osmolality is 295 mOsm/kg H2O. Red blood cells from this sample are then placed in the following solutions
Osmolality (mOsm/kg H2O) ? of solute
1. NaCl 300 1
2. fructose 300 0.5
3. urea 300 0
4. CaCl2 100 1
5. KCl 150 1
The red blood cells in which of these solutions will swell to the greatest degree?
A. 1
B. 2
C. 3
D. 4
E. 5
ANS: C
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