The lungs' airways (bronchial tubes) divide into smaller and smaller branches (bronchioles). The airways end in air sacs (alveoli) where oxygen moves into the blood.
| By | Healthwise Staff |
| Primary Medical Reviewer | E. Gregory Thompson, MD - Internal Medicine |
| Specialist Medical Reviewer | Ken Y. Yoneda, MD - Pulmonology |
| Last Revised | May 4, 2010 |
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