What Are Respiratory Bronchioles?

The end of the bronchioles is called terminal bronchioles, and there are alveolar openings on the wall of the bronchus, called respiratory bronchioles. The epithelium of the respiratory bronchioles is a single layer of cubic epithelium, and there are ciliated cells and secretory cells. At the alveolar opening, a single layer of cubic epithelium migrates to a single layer of flat epithelium with a small amount of annular smooth muscle fibers and elastic fibers outside the epithelium

Respiratory bronchioles

The end of the bronchioles is called terminal bronchioles, and there are alveolar openings on the wall of the bronchus, called respiratory bronchioles. The epithelium of the respiratory bronchioles is a single layer of cubic epithelium, and there are ciliated cells and secretory cells. At the alveolar opening, a single layer of cubic epithelium migrates to a single layer of flat epithelium with a small amount of annular smooth muscle fibers and elastic fibers outside the epithelium