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This document provides an overview of the histology of the respiratory system. It describes the major components, including the nose, pharynx, larynx, trachea, bronchi, bronchioles, and alveoli. For each component, it discusses the epithelial lining, underlying tissues like cartilage and smooth muscle, and histological structures. It emphasizes how the epithelial tissues and supporting structures change along the respiratory tract to condition air and facilitate gas exchange at the alveolar-capillary membrane. Diagrams and photomicrographs are included to illustrate histological features. The goal is to understand the microscopic anatomy and how it enables the functions of the respiratory system.Read less