Which granulocyte releases heparin and histamine to promote inflammation?

The correct choice involves the basophil, which is a type of granulocyte known for its role in the inflammatory response. Basophils release heparin and histamine, both of which are critical in the context of inflammation. Heparin acts as an anticoagulant, preventing blood from clotting too quickly in the inflamed area, while histamine increases the permeability of blood vessels, allowing fluids and immune cells to access the site of injury or infection more effectively. This action promotes the overall inflammatory response, facilitating healing and defense mechanisms in the body.

In contrast, neutrophils primarily function in the early stages of the immune response, primarily targeting bacteria and other pathogens through phagocytosis. Eosinophils are mainly involved in combating parasitic infections and have roles in allergic reactions rather than promoting inflammation directly through the release of heparin and histamine. Lymphocytes, while critical to the immune system, are mostly involved in adaptive immunity, including the production of antibodies and cell-mediated responses.