# Which type of cell accumulates wherever allergic reactions take place (e.g., asthma)?
a. Neutrophils.
b. Monocytes.
c. Eosinophils.
d. Basophils.
The correct answer is C. Eosinophils.
Neutrophils can squeeze through the capillary walls and into infected tissue where they kill invaders (e.g., bacteria) and engulf the remnants by phagocytosis. Monocytes leave the blood and become macrophages. Eosinophils are a type of white blood cell that contain granules and take up the red dye eosin. They accumulate wherever allergic reactions (e.g., asthma) occur. Their natural role is in the defense of parasites and other microorganisms. Basophils are a type of white blood cell filled with blue-staining granules of chemicals including histamine, serotonin, bradykinin, heparin, and cytokines such as prostaglandins and leukotrienes. In addition, basophils can digest microorganisms and are responsible for allergy symptoms.
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