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Problem set: water and solute movement across membranes

c.

to solution A and then back to solution B

d.

to solution B and then back to solution A

e.

there will be no movement of water in this case

7.

A 300 mOsM urea solution is __________

a.

hyposmotic to a 200 mM solution of NaCl.

b.

hyperosmotic to a 200 mM solution of NaCl.

c.

isosmotic to a 200 mM solution of NaCl.

d.

isosmotic to a 600 mM solution of NaCl.

e.

isosmotic to a 0.18 % solution of NaCl.

8.

If a 10% KCl solution is separated from a 20% KCl solution by a membrane impermeable to K+ and to Cl-, in which direction will net movement of water occur?

a.

from the 10% KCl solution to the 20% KCl solution

b.

from the 20% KCl solution to the 10% KCl solution

c.

there will be no net movement of water in this case

d.

water moves with K+ across the membrane

e.

back and forth between the solutions

9.

Which statement about water movement between the ICF and ECF is true?

a.

A higher NaCl osmolarity in a compartment will cause net water movement into it.

b.

A higher glucose osmolarity in a compartment will cause net water movement into it.

c.

A lower NaCl osmolarity in a compartment will cause net water movement into it.

d.

Equal osmolarities of NaCl and glucose will affect water movement the same.

e.

Equal molarities of  NaCl and glucose will affect water movement the same.

10.

Imagine that a lab osmometer is used to test ten samples from the same solution. The osmometer  is contaminated so that it always adds 15 mOsM to the true solution concentration of 143 mOsM, but gives a value of 158 mOsM  each test.  The values collected are …

a.

precise and accurate

b.

imprecise but accurate

c.

precise but inaccurate

d.

imprecise and inaccurate

11.

An intravenous 10 % glucose in 0.45% NaCl solution is…

a.

isosmotic and hypotonic

b.

isosmotic and isotonic.

c.

isosmotic and hypertonic.

d.

hyperosmotic and hypotonic.

e.

hyperosmotic and isotonic.

f.

hyperosmotic and hypertonic.

12.

If a 2 liter solution with 8 osmoles of glucose  (A) is separated from a 6 liter solution with 10 osmoles of glucose (B) by a membrane permeable to glucose and to water, in which direction will movement of water occur?

a.

from solution A to solution B

b.

from solution B to solution A

c.

to solution A and then back to solution B

d.

to solution B and then back to solution A

e.

water will never move between A and B

13.

If a 4-liter solution with 10 osmoles total of sucrose  (A) is separated from a 5-liter solution with 20 osmoles total of sucrose (B) by a membrane impermeable to sucrose and permeable to water, in which direction will movement of water occur?

a.

from solution A to solution B

b.

from solution B to solution A

c.

to solution A and then back to solution B

d.

to solution B and then back to solution A

e.

there will be no movement of water in this case

14.

A 400 mM NaCl solution is __________

a.

hyposmotic to a 500 mOsM solution of glucose.

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