Human lung bronchus, light micrograph

Human lung bronchus, light micrograph

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Lung bronchus. Light micrograph of a section through a human bronchus. Bronchi form branches from the trachea and gradually diminish in diameter with increasing branching within the lung. Bronchi are recognized by crescent-shaped, incomplete rings of cartilage that ensure the patency of the airway. A circumferential ring of smooth muscle (purple) is seen underlying the epithelial lining ( blue) of the bronchus. Contraction and relaxation of the smooth muscle modifies the shape and diameter of the bronchial epithelial tissue. Mucous secreting seromucous glands are also present. (yellow/green). Magnification: x150 when printed at 10 centimetres across.

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Keywords: airway, anatomical, anatomy, biological, biology, bronchial, bronchus, cartilage, cell, cells, cellular, cross-section, epithelial lining, healthy, histological, histology, human body, light micrograph, light microscope, lm, lumen, lung, mucous, mucus., no-one, nobody, normal, pulmonary, respiratory, respiratory system, section, sectioned, seromucous, smooth muscle, tissue

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