This is an old revision of this page, as edited by Tawkerbot2 (talk | contribs) at 00:21, 2 May 2006 (BOT - rv 67.186.186.75 (talk) to last version by 65.96.73.207). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 00:21, 2 May 2006 by Tawkerbot2 (talk | contribs) (BOT - rv 67.186.186.75 (talk) to last version by 65.96.73.207)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)The bronchioles are the first airway branches that no longer contain cartilage. They are branches of the bronchi, and are smaller than one millimetre in diameter.
There are no glands or cartilage in any of the bronchioles, and the epithelial cells become more cuboidal in shape.
Bronchioles divide until they become terminal bronchioles. After these the respiratory bronchioles have sporadic alveoli on their walls. Eventually the respiratory tract branches into alveolar ducts, then alveolar sacs.
Bronchospasm, a life-threatening situation, occurs when the smooth muscular tissue of the bronchioles constricts, severely narrowing their diameter. Bronchospasm is commonly treated by oxygen therapy and bronchodilators.
The medical condition of inflammation of the bronchioles is termed bronchiolitis. Diseases of the bronchioles include asthma, bronchiolitis obliterans, respiratory syncytial virus infection, and influenza.
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