Primary Bronchiole
The bronchioles or bronchioli are the first passageways by which the air passes through the nose or mouth to the air sacs of the lungs in which branches no longer contain cartilage or glands in their submucosa. They are branches of the bronchi. The bronchioles terminate by entering the circular sacs called alveoli.
Read more about Primary Bronchiole: Structure, Primary Bronchioles, Pathology, Additional Images
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—Ralph Waldo Emerson (1803–1882)