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When you breathe, air travels through your nose, down the trachea, and into smaller airways called bronchi. Bronchi branch into even smaller passages called bronchioles, and finally into tiny, thin, fragile grape-like sacs called alveoli.

Sometimes the bronchi and bronchioles can become obstructed and block airflow. This can cause all or part of the lungs to collapse, a condition called atelectasis. There are several different causes of blockage: a foreign body in the air passages, pressure ... more