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The bronchial 'tree':
The pharynx is the trunk. The primary bronchi are the first two large branches. 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.
The terminal bronchiole branches to form several respiratory bronchioles, where gas exchange takes place.

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Bronchioles.

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Q: Inside the chest each bronchus divides into smaller and smaller passageways known as?
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Related questions

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