. Elementary biology; an introduction to the science of life . Fig. 46. How the haddock breathes In the fishes the gills are arranged on arches along both sides of the pharynx. Water is taken through the mouth and passes over the gills and out again, as indicated by the arrows containing many delicate blood vessels. As the water passes over the gills the oxygen in solution diffuses into the blood from the surrounding water (see Fig. 46). In the bony fishes the gill-slits and the gills are covered over by a special plate- like shield. In the amphibians the adults breathe the air into the mouth
. Elementary biology; an introduction to the science of life . Fig. 46. How the haddock breathes In the fishes the gills are arranged on arches along both sides of the pharynx. Water is taken through the mouth and passes over the gills and out again, as indicated by the arrows containing many delicate blood vessels. As the water passes over the gills the oxygen in solution diffuses into the blood from the surrounding water (see Fig. 46). In the bony fishes the gill-slits and the gills are covered over by a special plate- like shield. In the amphibians the adults breathe the air into the mouth and swallow it into the lungs, and all the higher \ertebrates breathe by means of lungs.
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
