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WAEC Biology 2009 Question 21

Question 21

Homeostasis

The reason why hospitals use saline solutions as drip instead of water is

  1. A.because salt is a preservative.
  2. B.to prevent contamination of the body.
  3. C.to maintain the composition of body fluids.
  4. D.to increase the number of blood cells.
Show the answer and explanation

Answer: C (to maintain the composition of body fluids.)

Explanation

Saline has the same salt concentration as blood plasma, so it keeps body fluids balanced; plain water would make blood cells swell and burst.