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An experiment was carried out to investigate the effect of different concentrations of sodium chloride on human red blood cells. Equal amounts of blood were...

      

An experiment was carried out to investigate the effect of different concentrations of sodium chloride on human red blood cells. Equal amounts of blood were added to equal volumes of the salt solution but of different concentrations. The results are shown in the table below.

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(a) Account for the results in the set-up

(b) If the experiment was repeated using 1.4% sodium chloride solution, state the expected results with reference to:

(i) the number of red blood cells

(ii) the appearance of red blood cells if viewed under the microscope

  

Answers


Martin
A-no change in; number because 0.9% sodium chlorine solution is isotonic to RBC/blood;

B-fewer in number because 0.3% sodium chloride solution is hypotonic to RBC/blood
therefore some water was drawn in to RDC by osmosis ;leading to haemolysis/boosting of RBCs

b)
i)number will not change;

ii)RBC will appear small in size/wrinkled/crenated/shriveled/shrink
marto answered the question on October 3, 2019 at 10:40


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