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Summary of the cross-sections. Trachea Ciliated Epithelium with Goblet Cells Smooth muscles, mucous glands and blood vessels C-shaped/incomplete ring of Cartilage Bronchus/Bronchi Ciliated Epithelium with Goblet Cells Smooth muscles, mucous glands and blood vessels Irregular arrangement of Cartilage Bronchiole Ciliated Epithelium only Smooth muscles, blood vessels Alveoli Squamous Epithelium Elastic fibres
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