what is allergy and how effect in body.
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Answer:a damaging immune response by the body to a substance, especially a particular food, pollen, fur, or dust, to which it has become hypersensitiveis allergy
Explanation:As the mast cells destroy the allergens, a chemical called histamine is released into the bloodstream. A large amount of histamine swells body tissues (inflammation), causes itching, enlarges blood vessels, increases secretions, and causes bronchospasm (tightening of muscles that surround the airways).
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