define tracheal system
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a stiff-walled tube of the respiratory system that connects the pharynx with the lungs. 2 : a breathing tube of an insect that connects with the outside of the body and carries oxygen directly to the cells. trachea. noun.
Explanation:
Insects have a tracheal respiratory system in which oxygen and carbon dioxide travel primarily through air-filled tubes called tracheae. Usually the tracheal system penetrates the cuticle via closeable valves called spiracles and ends near or within the tissues in tiny tubes called tracheoles.
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