Tracheal

Simple diffusion alone would not be enough to provide oxygen to larger or more active insects' tissues. Diffusion in insects is aided by the tracheal system, which delivers oxygen to all its tissues; this is aided further in some insects by simple ventilation due to movement of wings and muscle ...

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Except that diffusion's not the right answer - insects use a separate oxygen distribution system, the tracheal system, although some do carry oxygen in the hemolymph, using a variety of carriers. Insects are too large (and waterproof) and have metabolisms that are much too ...

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... include blood composition : annelids have free hemoglobin in their blood, arthropods don't have any pigment in their blood since they have tracheal respiration and the others have hemocyanine as respiratory pigment (also circulating free in the blood).

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satrohraj - really All??? So why you posted this topic? Spiders die more rapidly if they cuted, becouse they (most of them) have not tracheal systrm and oxygene suppled to they's tissies by the blood, so if we will cut they's body (cat off relative large part) we destroy blood system and ...

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There are many.. 1. Exoskeleton 2. jointed legs 3. Tracheal respiration 4. Wide Range of habitats (air+water+land) etc

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