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During inhalation mouth cavity is lowered due to muscle contraction. This increases volume of the mouth cavity but reduces the pressure. As a result water flows into the mouth cavity through the open cavity. Each closed operculum on either side of the mouth bulges outwards to cause reduction of pressure in the gill cavity so that water containing oxygen may flow through the mouth cavity to the gill chambers over the gills. The higher external pressure presses the flexible free edge of each operculum against the side of the mouth of the fish. Water entering the mouth has a higher concentration of oxygen than in he gill filament due to this difference oxygen diffuses from water flowing over the gills into the blood through the thin walls of the blood capillaries. Oxygen then combines with haemoglobin and is transported to all parts of the body.
eddynightsy answered the question on April 17, 2018 at 10:38
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