Question on: JAMB Biology - 2021
The sequence of the one-way gaseous exchange mechanism in a fish is?
A
mouth --> operculum -> gills
B
mouth -> gills > operculum
C
operculum > gills -> mouth
D
gills -> operculum --> mouth
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Correct Option: B
Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing counter-current exchange. The gills push the oxygen-poor water out through openings in the sides(opercula) of the pharynx.
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