1. The bronchioles change diameter to either increase or reduce air flow. 2. The bronchioles have no cartilage and are surrounded instead by smooth muscle. 3. The diameter of the bronchioles plays an important role in air flow. 4. These cells may secrete glycosaminoglycans to protect the bronchiole lining. 5. In human anatomy, respiratory bronchioles exist proximal to the alveolar ducts. 6. The term " bronchiolitis " generally refers to inflammation of the bronchioles . 7. The bronchi branch off into smaller sections inside the lungs, called bronchioles . 8. Lung tissue distal to a completely obstructed bronchiole often does not become infected. 9. However, infection is common in lungs distal to a partially obstructed bronchiole . 10. Organized bronchiole created with MagPen " ! and Bio-Assembler " !.
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