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Unformatted text preview: primary sites for gas exchanges. Blood flows through the lamellae in the opposite direction of the water flow through the gill filaments. The gills ventilation is made up of an expansion of the area behind the mouth, this causes the water to enter through the fishes mouth. After this the water is accelerated over the gills by a simultaneous contraction of the bucal cavity and the expansion of the gill chamber. The opening of the plate covering the gills helps this. This is what we see as a pumping action of the mouth and the opercula in our fish. To recapulate fish have a very different breathing system then us....
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- Fall '10