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"
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,