Spiracle (arthropods)

A spiracle or stigma is the opening in the exoskeletons of insects, myriapods, velvet worms and many arachnids to allow air to enter the trachea. In insects, gas exchange occurs largely through a network of tracheae and air sacs that deliver oxygen directly to tissues and remove carbon dioxide; the circulatory system plays a comparatively minor role in oxygen transport and carbon dioxide removal. Tracheal tubes connect to the outside through spiracles, which can be specialized to regulate airflow and limit water loss.

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