Bronchioles are intrapulmonary airways that start from the 4th generation and continuously bifurcate until they reach the alveolar ducts. They are called terminal bronchioles from the 15th to the 16th generations and respiratory bronchioles from the 17th to the 19th generation . The caliber of the airways decreases from the trachea to the distal branches: bronchioles are approximately 1 mm in diameter or less. While surprisingly numerous, they are very short in length [2,3].
KeywordsCiliated Cell Clara Cell Terminal Bronchiole Alveolar Duct Respiratory Bronchiole
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