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Practice Reading: Fill in The Blanks (Drag & Drop)
ID: #34582
Allergies
Instructions
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Allergies are abnormal immune system reactions to things that are typically harmless to most people. When you’re allergic to something, your immune system believes that this substance is harmful to your body. Substances that cause allergic reactions — such as certain foods, dust, plant pollen, or medicines — are known as allergens. In an attempt to the body, the immune system produces IgE to that allergen. Those antibodies then cause certain cells in the body to chemicals into the bloodstream, one of which is histamine. The histamine then on a person's eyes, nose, throat, lungs, skin, or gastrointestinal tract and causes the symptoms of the allergic reaction. Future exposure to that same allergen will trigger this antibody response again. This means that every time you come into contact with that allergen, you'll have an allergic reaction.
antibodies
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