Allergens in trachea

Allergens in trachea

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This image is part of the feature Understanding Asthma


Caption: Trachea covered in allergens. Coloured Scanning Electron Micrograph (SEM) of the surface of the trachea (windpipe) with breathed in pollen and dust. These airborne particles may cause asthma or hay fever (allergic rhinitis). Pollen grains are coloured pink. The surface of the trachea is made up of cells with hair-like cilia (yellow). Together with mucus, these cilia serve to trap airborne particles and by beating upwards in a wave-like motion they remove foreign matter from the air tubes and lungs. In asthmatic or allergic patients, such particles may lead to a hyper- sensitive reaction causing breathing difficulties. Magnification: x2,000 at 6x7cm size. x6,500 at 8x10".

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