Example is tilapia
the mouth opens and the floor of the mouth is lowered so that the volume in the mouth is increased and pressure is lowered
water then enters into the mouth cavity
the mouth is closed and the floor of the mouth raised so that the volume is reduced this raises the pressure, forcing water over gills and out through the operculum
As water passes over the gills oxygen diffuses due to concentration gradient (partial pressure) into the blood stream.
In the body tissues, carbon IV oxide diffuses into the blood (due to concentration gradient, and is transported to the gills and diffuses out into the water.
Mohaissack answered the question on October 5, 2017 at 11:56
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