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During normal respiration, air travels through the nose, down the trachea, and into smaller and smaller airways called bronchi. The bronchi divide into bronchioles, and finally into tiny grape-like clusters of thin, fragile sacs called alveoli. In alveoli, oxygen is exchanged for carbon dioxide in the blood.

Bronchiectasis is an abnormal destruction and widening of the bronchi due to recurrent inflammation or infection. This results in the airways becoming abnormally enlarged. Extra mucus tends to form ... more