Summary of the crosssections.

Trachea
Ciliated Epithelium with Goblet Cells
Smooth muscles, mucous glands and blood vessels
Cshaped/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