fish-breathing

fish-breathing - (skin flaps) maintain a one-way flow skin...

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2 Breathing Head of herring with operculum cut away to reveal gills.There are usually 4 gills on each side Gill filaments (detail) The thousands of fine branches on each filament expose a large surface area to the water. Blood circulates in the filament branches and is separated from the water by a thin epithelium so that oxygen and carbon dioxide diffuse through easily gill bar gill filaments Breathing current Water is taken in through the mouth, passes over the gills and is expelled via the operculum. Movements of the mouth floor and operculum create the current and the ‘valves’
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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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