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Some allergens trigger sneezing and whee...

Some allergens trigger sneezing and wheezing in human beings.What causes this type of response by the body?

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Allergen acts as an antigen and stimulates the formation of IgE type antibodies which bind to mast cells. These antibody-bound mast cells bind more antigens and release histamine and serotonin which cause hypersensation, sneezing and wheezing
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