Trachea and two primary bronchi referred as bronchial tree.
Trachea (conducting portion consist) "dead space" air is present in that area but no gas exchange occurring. Epithelium tissue help to remove debris from air.
Bronchi - Primary bronchi
Secondary bronchi
Tertiary bronchi
Bronchioles - Terminal bronchioles
Respiratory bronchioles (gas exchange happen) respiratory portion consist-
Alveolar duct
Alveolar sacs
Alveoli
Bronchi have cartilage and mucus glands in their walls but bronchioles do not.
Bronchioles contains more smooth muscle tissue than bronchi.
Both bronchi and bronchioles are lined with ciliated columnar epithelium.
Respiratory bronchioles more deeply into lungs. Epithelial lining changes from simple cubodial to simple squamous in the alveolar duct and alveoli.
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