After water enters the mouth, fish ventilate their gills by closing the mouth, raising the floor to increase pressure, and forcing water over the gills as the operculum opens.
After water enters the mouth, fish ventilate their gills by closing the mouth, raising the floor to increase pressure, and forcing water over the gills as the operculum opens.
| Front | Describe how the gills of a fish are ventilated after water has entered through its mouth. ( 3 marks) |
|---|---|
| Back | fish closes mouth and raises the floor of the mouth; this decreases the volume / increases the pressure (of mouth); Increased volume / decreased pressure of opercular cavity; water forced over the gills; operculum / opercular valve opens; |
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