PEIR Digital Library

Welcome to the Pathology Education Informational Resource (PEIR) Digital Library, a multidisciplinary public access image database for use in medical education.

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DIAGRAM: BRONCHUS: Asthma: Normal airway, low magnification, ciliated epithelial cells; Arrows on Ciliated Epithelial Cells -- The tone of the normal airway is regulated to allow the air to pass freely through the bronchi. The inside of the airway is lined with ciliated epithelial cells that are believed to secrete a relaxant