Question

An allergic reaction is an over-reaction of the ______ to an environmental ______.

Answer 1

An allergic reaction is an over-reaction of the immune system to an environmental antigen.

Explanation:

Allergy is an exaggerated response of the immune system to certain antigens present in the environment, known as allergens. These allergens, often foreign proteins such as dust mites, pollens, or animal dander, provoke an immune response leading to allergic symptoms. The antibodies typically involved in this reaction are of the IgE type, and allergy symptoms result from the release of histamine and other substances from mast cells.