Trachea - flexible airway supported by rings of cartilage, preventing collapse. Cilia in the trachea move the mucus to the throat.
Bronchi - two divisons of the trachea, each leading to one lung.
Bronchioles - branching subdivisions of the bronchi.
Alveoli - minute air-sacs with a large surface area and thin wall (increasing the efficiency of gas exchange).
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