Bronchi
The branching airways that carry air from the trachea into the lungs.
Structure
Section titled “Structure”The trachea splits into two main bronchi, one per lung, which divide again and again into ever-smaller branches — the “bronchial tree” — ending in tiny bronchioles.
What they do
Section titled “What they do”- Conduct air deep into the lungs.
- Adjust airflow — the smallest bronchioles can widen or narrow.
- Continue cleaning the air with mucus and cilia.
Key idea
Section titled “Key idea”The bronchial tree is a distribution network — repeated branching spreads incoming air across the lungs’ enormous internal surface.