Biology / Bio 3149 · Atom · ~20 seconds
Tracheal System in Insects
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An insect's tracheal system delivers air directly to tissues through branching tubes opening at external spiracles, exchanging gases without relying on blood at all.
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Fine tracheole branches reach individual muscle cells directly, bypassing the circulatory system for oxygen delivery.
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A tracheal system still limits body size, since diffusion through air-filled tubes only reaches so far into a large body.