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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).
| A.
300 mmol/l sucrose |
Osmolarity
Tonicity
Net
water movement
|
|
|
| B.
300 mmol/l urea |
Osmolarity
Tonicity
Net
water movement
|
|
|
| C.
400 mmol/l urea |
Osmolarity
Tonicity
Net
water movement
|
|
|
 |
