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Which one of the following statements is incorrect?

  1. A
    The residual air in lungs slightly decreases the efficiency of respiration in mammals
  2. B
    The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
  3. C
    In mammals, circulating body fluids serve to distribute oxygen to tissues
  4. D
    The principle of countercurrent flow facilitates efficient respiration in gills of fishes

Solution & Step-by-step Explanation

Residual volume ensures continuous gaseous exchange and prevents alveolar collapse; it does not "decrease" respiratory efficiency but is an adaptation for continuous breathing. (Note: Standard answer keys typically flag statement A as incorrect).

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Try it yourself before checking the explanation above.

Which one of the following statements is incorrect?
A
The residual air in lungs slightly decreases the efficiency of respiration in mammals
B
The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
C
In mammals, circulating body fluids serve to distribute oxygen to tissues
D
The principle of countercurrent flow facilitates efficient respiration in gills of fishes

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Breathing and Exchange of Gases

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