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This stock medical exhibit features illustrations comparing airway abnormalities as seen in a cross-sectional view of the main bronchus. The first illustration provides a view of the normal anatomy of a bronchus. The second illustration shows the softening of the cartilage ring that leads to the collapse of the bronchus found in tracheomalacia. The third illustration depicts the contraction of the smooth muscle in the bronchial wall constricting the lumen of the bronchus found in bronchospasm. The final image shows the bronchial lumen obstructed by a thick plug of mucus found in a mucus plug.