Which type of white blood cell contains preformed granules of vasoactive amines?
a. Neutrophil
b. Eosinophil
c. Monocyte
d. Basophil
ANS: D
Basophils have cytoplasmic granules that contain vasoactive amines (e.g., histamine) and an an-ticoagulant (heparin). Their function is similar to tissue mast cells. Neutrophils are the chief phagocytes of early inflammation. Eosinophils ingest antigen-antibody complexes and are in-duced by IgE-mediated hypersensitivity reactions to attack parasites. Monocytes do not have amines, and their job is to help fight infection.
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