| 11. | The bronchioles ( small airways ) fill up with mucus leading to laboured breathing.
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| 12. | There are usually three arteries, and they branch alongside the bronchi and bronchioles.
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| 13. | These bronchioles give rise to the air sacs in the lungs called the alveoli.
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| 14. | Bronchioles possess the same columnar epithelial lining, but are not surrounded by cartilage rings.
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| 15. | Lung parenchyma is the substance of the lung outside of the alveoli and respiratory bronchioles.
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| 16. | The same goes for goblet cells, although there are scattered ones in the first bronchioles.
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| 17. | Levosalbutamol relaxes the smooth muscles of all airways, from the trachea to the terminal bronchioles.
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| 18. | If the bronchiole is completely obstructed, atelectasis occurs : the alveoli of the lung collapse.
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| 19. | But the infection can then move into the lower respiratory tract-- the bronchioles and lungs.
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| 20. | The lobes of the lungs are further divided into bronchopulmonary segments based on the locations of bronchioles.
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