The trachea and bronchi have a similar structure and only differ only in size:
- Much of the wall consists of cartilage; wich is in the form of C-rings.
- The inside surface contains elastic fibres, smooth muscle and blood vessels.
- The inner lining is a ciliated epithelium layer and among them, there are goblet cells.
The Bronchioles
- The bronchioles are much narrower than the bronchi.
- The larger bronchioles may have some cartilage, but smaller ones have no cartilage.
- The wall is mostly made up of smooth muscle and elastic fibres.
- The smallest bronchioles have clusters of alveoli at their ends.
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