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ndoor Environmental Quality: particulate matter



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Allergens in trachea - (high res image allow 60 seconds to load)
Illustration credit: Eddy Gray/Science Photo Library

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"

See also:
Indoor Air Quality - How lungs work ,courtesy of the National Heart, Lung, and Blood Institute (as a part of the National Institutes of Health and the U.S. Department of Health and Human Services

Allergies: The Radical Theory of Sneezing, Tina Adler, Environmental Health Perspectives, Volume 113, Number 11, November 2005  


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