A) The residual air in lungs slightly decreases the efficiency of respiration in mammals
B) The presence of non-respirtory air sacs, increases the efficiency of respiration in birds
C) In insects, circulating body fluids serve to distribute oxygen to tissues
D) The principle of countercurrent flow facilitates efficient respiration in gills of fishes
Correct Answer: A
Solution :
Residual air is the air that remains in lungs after the most forceful expiration. It is about 1,200 mL. As the residual air remains in the lungs therefore, it has no effect on respiration efficiency.
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