Bronchiole

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Bronchiole
Alveoli diagram.png
Diagram of the alveoli with both cross-section and external view.
Gray's subject #240 1098

The bronchioles or bronchioli are a part of the lung. They are the first airway branches that no longer have cartilage. They are branches of the bronchi. The bronchioles end by entering the circular sacs called alveoli.