http://en.wikipedia.org/wiki/White_blood_cell
There are several different types of white blood cells. They all have many things in common, but all are distinct in form and function. A major distinguishing feature of some leukocytes is the presence of granules; white blood cells are often characterized as granulocytes or agranulocytes:
- Granulocytes (polymorphonuclear leukocytes): leukocytes characterized by the presence of differently staining granulesin their cytoplasm when viewed under light microscopy. These granules (usually lysozymes) are membrane-boundenzymes that act primarily in the digestion of endocytosed particles. There are three types of granulocytes: neutrophils,basophils, and eosinophils, which are named according to their staining properties.
- Agranulocytes (mononuclear leukocytes): leukocytes characterized by the apparent absence of granules in their cytoplasm. Although the name implies a lack of granules these cells do contain non-specific azurophilic granules, which are lysosomes. The cells include lymphocytes, monocytes, and macrophages.
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