tracheole
Sign in to savethumb|right|Tracheal system of the mite Stigmaeus humilis (C. L. Koch). [[Anthonie Cornelis Oudemans, 1913.]] Tracheole (trā'kē-ōl') is a fine respiratory tube of the trachea of an insect or a spider, part of the respiratory system.
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thumb|right|Tracheal system of the mite Stigmaeus humilis (C. L. Koch). [[Anthonie Cornelis Oudemans, 1913.]] Tracheole (trā'kē-ōl') is a fine respiratory tube of the trachea of an insect or a spider, part of the respiratory system.
Tracheoles are about 1 μm in diameter, and they convey oxygen to cells while providing a means for carbon dioxide to escape.