What type of blood cell is mainly involved in allergic reactions?

The type of blood cell that is primarily involved in allergic reactions is basophils. Basophils are a type of white blood cell that plays a crucial role in the immune response, particularly in allergic reactions and inflammation. They contain granules rich in histamine and other chemicals that are released during an allergic response, contributing to symptoms such as itching, swelling, and redness.

When allergens enter the body, basophils are activated and release histamine, which dilates blood vessels and increases permeability, allowing other immune cells to access and address the allergens effectively. This is a vital part of the body's defense mechanism against perceived threats.

In contrast, while eosinophils are also involved in allergic reactions and play a role in combating parasitic infections, it is the basophils that are primarily responsible for the immediate hypersensitivity reactions characteristic of allergies. Thus, the focus on basophils in understanding allergic responses is critical in the field of immunology and allergy management.