A tracheal tube may contain ridge-like circumferential rings of taenidia in various geometries such as loops or helices. In the head, thorax, or abdomen, tracheae may also be connected to air sacs. Many insects, such as grasshoppers and bees, which actively pump the air sacs in their abdomen, are able to control the flow of air through their body. In some aquatic insects, the tracheae exchange gas through the body wall directly, in the form of a gill, or function as normal, via a plastron. Despite being internal, the tracheae of arthropods are shed during moulting (ecdysis).= = = Pete Smith (baseball, born 1966) = = =
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