Osmolarity & Diffusion HW help?

Movement of water between plasma, extracellular fluids, and intracellular fluid

occurs largely by osmosis, and depends on the relative osmolarity of fluids on either side

of a membrane. Recall that water moves from areas of high to low water concentration,

which corresponds to moving from areas of low to high solute concentration. To maintain

homeostasis, the osmolarity of different body compartments must be carefully regulated.

1. The osmolarity of plasma is maintained at about 300 mOsM.

a. What would the osmolarity inside a red blood cell be to maintain

equilibrium between the intracellular fluid and plasma?

b. If the osmolarity of plasma increased, what would happen to the size of a

red blood cell?

c. If the osmolarity of plasma decreased, what would happen to the size of a

red blood cell?