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 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: C
Solution :
The circulatory system of insects is open, whereby blood (haemolymph) flows freely through the body cavity (haemocoel). There is a dorsal vessel which forward along the dorsal midline and opens in the head at the anterior portion (aorta). There are several chambers and openings (ostia), along the dorsal vessel where blood enters it through valves. The blood is then pumped forward to the aorta and into the body cavity. Blood contains water-about 90%; inorganic ions-dissolved salts of Na, K, Ca, Mg; organic molecules-amino acids, sugars for muscle use; blood cells. Haemolymph does not contain an oxygen carrying pigment such as Hb, hence, does not assist in respiration.
You need to login to perform this action.
You will be redirected in
3 sec
