Which one of the following statements is incorrect ?

Options

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

Answer

A

Explanation

In insects the fluid does not serve to distribute oxygen to tissue. It is done by a fine network of trachea and tracheoles.