A) counter current exchange
B) ventilation
C) facilitated diffusion
D) active respiration
Correct Answer: A
Solution :
The breathing movement in teleost fish occurs in two steps in which the gill chambers working as suction pumps. The blood in the blood capillaries of the gill lamillae flows in a direction opposite to the flow of water over the surface of lamellae, this system is called counter current system. As fresh respiratory water passes over gill filament, their body gives up \[\text{C}{{\text{O}}_{2}}\]and absorbs \[{{O}_{2}}\]from water. Facilitated diffusion is a special type of passive transport, in which ions or molecules cross the membrane rapidely because specific permeases in the membrane facilitate their crossing.
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