ANATOMY

Detailed explanation-1: -In your lungs, the main airways, called bronchi, branch off into smaller and smaller passageways. The smallest airways, called bronchioles, lead to tiny air sacs called alveoli.

Detailed explanation-2: -(BRONG-kee-ole) A tiny branch of air tubes in the lungs. Enlarge.

Detailed explanation-3: -Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs).

Detailed explanation-4: -Your bronchioles are some of the smallest airways in your lungs. Inhaled air passes through tiny ducts from the bronchioles into elastic air sacs (alveoli).

Detailed explanation-5: -What Are Tracheal and Bronchial Stenosis? Stenosis refers to an abnormal narrowing. Tracheal stenosis is the narrowing of the trachea, or windpipe, and bronchial stenosis is the narrowing of the bronchial tubes, which branch off the trachea into the lungs.