BIO 2135 Quiz: Bony fish keywords
21 Oct 2015
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Bony fish: a fish having a bony rather than cartilaginous skeleton. Calcified bone: bone impregnated with calcium or calcium salts. Concurrent exchange: the water and blood flows in the same direction, so only about half of the oxygen in the water would be able to be absorbed. The water is now forced back out of the fish through the operculum. Counter current exchange: the fish takes in water through the mouth, and pushes it over the the gill filaments and lamellae. The direction of blood flow through the filaments and lamellae is in the opposite direction to the water being forced over them. Ctenoid scale: a thin, acellular structure composed of bonelike material and characterized by a serrated margin; found in the skin of advanced teleosts. Cycloid scale: a thin, acellular structure which is composed of a bonelike substance and shows annual growth rings; found in the skin of soft- rayed fishes.
