Bronchioles are small, thin-walled airways in the respiratory system that branch off from the larger bronchi. They are key components of the bronchial tree, which conducts air to the lungs' alveoli, where gas exchange occurs. Bronchioles lack cartilage and are composed primarily of smooth muscle and epithelial tissue, allowing them to constrict or dilate in response to various stimuli, such as allergens or irritants. They play a crucial role in regulating airflow and ensuring that air reaches the alveoli efficiently. Bronchioles can be further classified into terminal bronchioles, which lead to respiratory bronchioles, and ultimately to the alveolar sacs.
Define bronchioles
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