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The circulatory system of insects is of the open type, in which blood or haemolymph is not confined entirely to vessels but flows freely within the body cavity or haemocoel. Unlike vertebrates, insect haemolymph does not transport oxygen, as respiration is carried out by the tracheal system. Instead, circulation serves primarily in the distribution of nutrients, hormones, metabolites, and in maintaining hydrostatic pressure. ___ _____ _________ __________ ________ _________ __________ __________ _____ _________ ________ ________.
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