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Allergy - Allergy Allergy is a term used to describe a...

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Allergy Allergy is a term used to describe a hypersensitivity disorder of the immune system. An allergy is an acquired, rapid and predictable response to an environmental or pharmaceutical substance, known as an allergen. Symptoms Allergies affect multiple tissues; however the principle mechanism is the same for each. Allergens activate IgE which in turn prompt mast cell to degranulation and release histamine. Histamine is an organic nitrogen compound that when released causes the surrounding capillaries to become more permeable. This increased permeability allows WBCs, proteins and fluid to escape from the vasculature. Normally, the immune system behaves in this way to allow the body to tackle infections, however in the case of allergies this system malfunctions due to IgE latching onto inert environmental compounds. Allergic reactions can be localised or systemic, as is the case for anaphylactic reactions. Common allergens and their effects are outlined below:- Animal Animal Dander
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