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Question
The symptoms of an allergic reaction develop in response to ______.
Fill in the Blanks
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Solution
The symptoms of an allergic reaction develop in response to histamine.
Explanation:
During an allergic reaction, the body’s immune system overreacts to harmless substances called allergens. This causes mast cells to release histamine, which leads to symptoms such as itching, swelling, sneezing, and inflammation.
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