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| respiratory system of insects ： ウィキペディア英語版 |
respiratory system of insects
An insect's respiratory system is the biological system with which it introduces respiratory gases to its interior and performs gas exchange.
==The respiratory system==
Air enters the respiratory systems of insects through a series of external openings called spiracles. These external openings, which act as muscular valves in some insects, lead to the internal respiratory system, a densely networked array of tubes called tracheae. This network of transverse and longitudinal tracheae equalizes pressure throughout the system.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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