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Terminal bronchioles are the airways produced by the last few divisions of the bronchioles within the bronchial tree before it becomes adapted to respiration. There are about 70,000 within each lung with diameters of around 0.1-0.2mm.
The structure of their walls is similar to that of the bronchi but they are more adapted to respiration:
There are three divisions of the the terminal bronchioles before respiratory bronchioles are first produced.
The bronchiole tree distal to a primary terminal bronchiole is termed a pulmonary lobule.