Neutrophils hasten to inflammatory sites. They are mobile cells and can pass through capillaries and engulf bacteria by phagocytosis.
Neutrophils secrete a fever inducing agent called pyrogen which also helps the body fight infection.
Eosinophils are named by virtue of the fact that the granules of cytoplasm are stainable with acid dyes, such as eosin. The exact function of eosinophils has been a mystery for many years. Basophils are formed in the bone marrow and have a polymorphic nucleus. The function of these cells is poorly understood. They are known to play a role in immediate hypersensitivity reactions and in some cell-mediated delayed reactions, such as contact hypersensitivity in humans, skin graft or tumor rejections and hypersensitivity to certain microorganisms in animals.