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Introduction:
The red blood cells found in many animals are very important to
the survival of the organism because they transport oxygen from
the gills, skin, or lungs to the cells of the various tissues
(muscles, nerves, etc.). These blood cells are transported in
a fluid (serum) that has approximately the same salt content as
sea water. In this exercise, using what you have learned about
diffusion and osmosis, you will design an experiment to test the
effects of solutions of various concentrations on red blood cells.
Materials available:
Microscope slides and cover slips, microscopes, blood, distilled
water, physiological saline (similar to blood serum), salt, osmosis
apparatus.
Method:
Design an experiment using the above materials to determine the
effects of solutions of various concentrations on red blood cells.
To do this you must state your hypothesis, write the procedure,
collect and record the data in an organized fashion, and report
your conclusion, supported by evidence gained in the experiment
and information you have gained from the previous exercises in
this unit.
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Science Education Connection Department of Biochemistry The University of Arizona Wednesday, February 12, 1997 johnmcc@dakotacom.net
http://biology.arizona.edu/sciconn/lessons/mccandless/ |
