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Sucrose (MW = 340 and NaCl (MW = 58.5) cannot cross the plasma membrane while urea (MW = 60) can.
Given this information, compare each of the following solutions to a red blood cell with respect to:
i) the osmolarity of the solution (Iso, Hyper, Hypo)
ii) the tonicity of the solution (Iso, Hyper, Hypo)
iii) the direction of net water movement when a RBC is placed in the solution (Into cell, Out of cell, No net movement).
| D. 300 mmol/l sucrose + 300 mmol/l urea |
 Osmolarity
Tonicity
Net water movement
|
|
|
| E. 300 mmol/l NaCl |
Osmolarity
Tonicity
Net water movement
|
|
|
| F. 200 mmol/l urea + 100 mmol/l NaCl |
Osmolarity
Tonicity
Net water movement
|
|
|
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