This is the first 1,000 characters of 1741 words (6.96 pages) in the essay titled Allergies
An allergy is an abnormal reaction to ordinarily harmless substance or substances. These sensitizing substances, called allergens, may be inhaled, swallowed or come into contact with the skin. When an allergen is absorbed into the body it triggers white blood cells to produce IgE antibodies. These antibodies attach themselves to mast cells causing release of potent chemical mediators such as histamine, causing typical allergic symptoms. A person who has allergies doesnít have a poor immune system, rather an over protective one. Their immune system fights the allergen when it comes in contact with it even though the allergen isnít harmful.
To diagnose allergies a physician will clean the personís back with alcohol, then mark it with an ink pen according to each substance going to tested. They are extracts of potential allergens in small vials. A drop of these is put on the corresponding mark on your skin, and then a needle is used to prick the skin. It breaks the surface of ...
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