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bronchiole
(brong´ke-ōl)
one of the successively smaller channels into which the segmental bronchi divide within the bronchopulmonary segments. adj.,
bronchi´olar., adj.
respiratory bronchioles
the final branches of the bronchioles, communicating directly with the alveolar ducts; they are subdivisions of terminal bronchioles, have alveolar outcroppings, and each of them divides into several alveolar ducts.
terminal bronchiole
the last portion of a bronchiole that does not contain alveoli; its sole function is gas conduction, and it subdivides into respiratory bronchioles.

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