IMED3001 Study Guide - Midterm Guide: Simple Columnar Epithelium, Simple Squamous Epithelium, Bronchus
14 Dec 2020
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Document Summary
Bronchioles have a diameter of 1. 0 mm or less, representing a branch of segmental bronchi. A bronchiole and the lung parenchyma that it supplies constitute a pulmonary lobule. Pseudostratified ciliated columnar epithelium in bronchi becomes simple ciliated columnar in the terminal bronchioles or simple cuboidal epithelium in the respiratory bronchioles. No goblet cells present in the bronchioles, except in smokers. No goblet cells but have clara cells. No cartilage but have prominent smooth muscle layer. A transitional zone in the respiratory system, involved in both air conduction and gas exchange. Same structure as terminal bronchioles except that the lining epithelium becomes simple cuboidal epithelium. The number of clara cells increases distally. Give off alveoli (alveolar outpocketings) and alveolar ducts. Do not possess a wall of their own. The surrounding alveoli open into these spaces. Sac-like invaginations present at the terminal end of the bronchial tree and forming the lung parenchyma. Under light microscope, alveoli resemble a honeycomb.
