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

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.

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