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Unformatted text preview: (skin flaps) maintain a one-way flow skin flaps prevent return of water Circulatory system The heart pumps blood forward in the ventral vessel and through the gill filaments where oxygen is absorbed and carbon dioxide expelled. The dorsal vessel carries oxygenated blood to all parts of the body gills operculum gullet vertebral column dorsal blood vessel circulation in gills ventral blood vessel heart capillary circulation in tissues gut mouth D.G. Mackean Breathing current Circulatory system air bladder (maintains buoyancy)...
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- Fall '11