A basophil is a type of white blood cell found in the human body. Basophils are part of the immune system and play a role in allergic reactions and inflammatory responses. Basophils contain granules filled with substances such as histamine, which are released when the cell is activated. When an allergic reaction occurs, basophils are involved in the immune response by releasing histamine, which triggers the dilation of blood vessels and increases their permeability. This response contributes to the characteristic symptoms of allergies, such as itching, redness, and swelling. Basophils also participate in immune defense against parasites. While they make up a small percentage of the total white blood cell count, basophils play an essential role in the body's immune response and maintaining overall health.

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