Bronchioles

Bronchiole Mucosa

 As bronchiThe large airways that branch from the trachea into the lungs, dividing into smaller bronchioles. give way to bronchiolesSmall airways branching from the bronchi that lead to alveoli; lack cartilage and control airflow wi, the diameter decreases as does the thickness of the smooth muscle. A gradual decrease in the height of the epithelium to simple columnar also occurs as the bronchioles decrease in diameter. 

Types of Bronchioles

Terminal bronchioles lead to respiratory bronchiolesSmallest bronchioles leading to alveolar ducts and alveoli. and the epithelium reduces again to simple cuboidal.  The smooth muscle layer starts to break up and is replaced by elastic fibers.