1.a) i. Prediction - After the infusion of one literacy sterile water by IV ,it will lead to decrease in the plasma osmolarity of the patient Mr. Dry.
a) ii. Explanation - when sterile water is infused it leads to transport of solute free water through tubular cells and back into blood ,it leads to decease in plasma osmolarity and increased urine osmolarity .
2. Mr. MB's RBC volume increases after infusion of sterile water. The infused sterile water expand the plasma volume and dilute the plasma osmolarity . The RBC osmolarity would decrease and plasma osmolarity would increase until the two solutions are equal
C. Total number of mOsm in the plasma = 300 mOsm
3liter is equal to 900 mOsm
After the infusion ,the plasma volume is 4L ( but still have 900mOsm ) . Therefore, the new plasma volume is 225 mOsm / L .
D. The osmolarity at equilibrium is = total mOsm / total volume
600 mOsm ( RBC ) + 900 mOsm ( plasma) = 1500mOsm
The total volume is 2L+ 3L+ 1L = 6L .
So, osmolarity is 1500 / 6 = 250 mOsm .
The new RBC volume is 600mOsm / 250mOsm = 2.4 L
and the plasma volume is 6L - 2.4 L = 3.6L
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