Respuesta :
This reversal of water flow would reduce efficiency of gas exchange.
Why does the direction of the blood flow across the gills' surface differ from the direction of the water?
Blood is pumped via the gills in the inverse direction of water flow over the gills. As a result, it is possible for blood oxygen levels to be lower than water oxygen levels. Diffusion is the process through which oxygen seeks out areas that are deficient in it.
In order to exchange gases, fish normally allow oxygen-rich water to enter through the mouth and pump over the gills while the operculum is still closed. They are able to have the surface area needed for the exchange of oxygen in the water for carbon dioxide in the fishes' blood thanks to the gill filaments. The carbon dioxide-rich, oxygen-deficient water is then forced out through the operculum.
Due to the directed structure of the gill filaments, which act as the gas exchange surface, if the process is reversed, the effectiveness of gas exchange will be significantly reduced.
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