The Anatomy and Physiology of Animals/Diffusion and Osmosis Worksheet 2/Worksheet 2 Answers

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1. Circle the correct answer.

a) When red blood cells are placed in an isotonic solution they: stay the same
b) Red blood cells are isotonic to: 0.9% salt solution
c) Red blood cells placed in a 2.0% salts solution would: shrink.
d) Red blood cells placed in distilled water would: swell
e) When red blood cells are placed in distilled water: the water enters the cells
f) Red blood cells placed in a 0.9% salt solution would: stay the same
g) Red blood cells placed in distilled water are in a: hypotonic solution.
h) Red blood cells placed in 0.9% salt solution are in an: isotonic solution
i) Red blood cells placed in a 2.0% salt solution are in a: hypertonic solution.
j) A dialysis bag (made of an artificial semi-permeable membrane) filled with 0.5% salt solution and placed in a beaker containing 3.0% salt solution will: shrink.

2. Three bottles are filled with three different solutions. One with distilled water, one with 0.9% salt solution and the third with 9.0% salt solution. A few dried apricots are placed in the three bottles and left in the solutions for an hour.

The apricots in bottle A stay the same.
The apricots in bottle B shrink
The apricots in bottle C swell.

Now answer the following questions:

i) Which bottle contains the most concentrated salt solution? B
ii) Which bottle contains water? C
iii) Which bottle contains the isotonic salt solution? A
iv) Which bottle contains the hypotonic solution? C
v) Which bottle contains the hypertonic salt solution? B

3.A semi - permeable membrane (dialysis) bag, containing 4% salt, 4% glucose and 4% albumin is suspended in distilled water. Assume the bag is permeable to all substances except albumin.

Semipermeable membrane bag experiment 2.JPG

a) The salt: moves out of the bag
b) The water: moves into the bag
c) The albumin: does not move
d) The glucose: moves out of the bag
e) The salt moves by: diffusion
f) The water moves by: osmosis
g) The albumin moves by: it does not move because the molecules are too large.
h) The glucose moves by: diffusion