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Problem set: water and solute movement across membranes - page 5 / 10

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Problem set: water and solute movement across membranes

24.

In the diagram below are ECF and ICF compartments separated by a membrane permeable to water and to Ca++.  Use this as the starting condition for the questions below. (16 pts)

 added solution:

8% CaCl2

ECF

2300 mosmoles

 10 liters

ICF

4500 mosmoles

 20 liters

a.

What is the initial osmolarity in the ECF before any CaCl2 solution is added?

b.

What are the two fluid compartments that make up the ECF (extracellular fluid)?

c.

One liter of the 8% calcium chloride solution will be added to the ECF.  What is the osmolarity of the CaCl2 solution before it is added?  (molecular weight of Ca= 40.1, Cl = 35.5) (CaCl2 has a disassociation constant of 3)

d.

After the CaCl2 solution is added, how does the osmolarity of the body (ECF and ICF) change? circle your answer:

osmolarity decreasesno change osmolarity increases

e.

The Ca2+ ion in the ECF diffuses through an open ion channel into the ICF but the Cl- ions cannot move into the ICF.  Which compartment, therefore, has a higher concentration of non-penetrating solutes after the addition of the CaCl2 solution (before water or solutes move)?

f.

Circle your answer for which way net water movement will be after the CaCl2 addition:

into ECFno net water movementinto ICF

f.

Based on your answer directly above, what is the tonicity of the CaCl2 solution?   

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