By Kathleen MacNaughton, R.N., About.com
Updated: February 28, 2008
About.com Health's Disease and Condition content is reviewed by Sanja Jelic, MD
Normal Bronchiole / Asthmatic Bronchiole
Photo courtesy of A.D.A.M.Definition: Bronchioles are small branches of the airways in your lungs. They branch off from the bronchial tubes and then the bronchioles branch into smaller sacs called alveoli.
Pronunciation: BRONK-ee-ohlz
Examples: Asthma causes narrowing and tightening of the bronchioles during an asthma attack.
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