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It is all a matter of size and there they are on the bronchial 'tree'. The pharynx is the trunk. The primary bronchi are the first two large branches (going to each lung). They branch to form tertiary bronchi.

Each tertiary bronchus branches into multiple bronchioles, which branch further into the very smallest conducting branches, the terminal bronchioles.
Each terminal bronchiole branches to form several respiratory bronchioles, where gas exchange takes place.

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