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Dara
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 Posted: Wed Mar 15, 2006 5:26 pm Post subject: What is an allergic reaction |
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[b:77d25e4f30]Every people have been suffering from allergy, it is eaither through foos, cosmetics, dust or else. In that case we must be aware about allergy reactions. Know the symptoms first and go for the treatment. Please let me know more about allergy reaction[/b:77d25e4f30]
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1888 Discuss
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| Posted: Wed Mar 15, 2006 5:26 pm |
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Jeck
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| Posted: Thu Mar 16, 2006 5:29 pm |
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According to American Academy of Allergy documents allergy reaction means -
The immune system serves as the body's defense mechanism against the countless different substances present in the air we breathe, the foods we eat, and the things we touch. Within this immense group of materials, the term "allergen" refers to any substance that can trigger an allergic response. Common allergens include pollen, mold, animal dander, and cockroach and house dust mite droppings.
Antibodies circulate in the bloodstream and are present in almost all bodily fluids. They help to capture unwanted invaders. People who have allergies have an antibody called Immunoglobulin E, or IgE. When allergens first enter the body of a person predisposed to allergies, a series of reactions occurs and allergen-specific IgE antibodies are produced. Following IgE production, these antibodies travel to cells called mast cells, which are particularly plentiful in the nose, eyes, lungs and gastrointestinal tract. The IgE antibodies attach themselves to the surface of the mast cells and wait for their particular allergen.
Each type of IgE has specific "radar" for one type of allergen only. That's why some people are only allergic to cat dander (they only have the IgE antibodies specific to cat dander) and others seem to be allergic to everything (they have many more types of IgE antibodies.)
The next time an allergic individual comes into contact with the allergens to which he or she is sensitive, the allergens will be captured by the IgE. This initiates the release of chemical "mediators" such as histamine and other chemicals from the mast cells. These mediators produce the symptoms of an allergic reaction, such as swelling of tissues, sneezing, wheezing, coughing and other reactions. Please refer www.aaaai.org
source: www.aaaai.org |
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