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Gill - Encyclopedia, History, Geography and Biography (480 words) |
 | In aquatic organisms, gills are respiration organs for the extraction of oxygen from water and the excretion of carbon dioxide. |
| Gills are usually thin plates of tissue or slender tufted processes and, with the exception of some aquatic insects, they contain blood or coelomic fluid, which exchanges gases through their thin walls. |
| The gills of other insects are of the tracheal kind and also include both thin plates and tufted structures, and, in the larval dragon fly, the wall of the caudal end of the alimentary tract (rectum) is richly supplied with tracheae as a rectal gill. |
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