Agranulocytes

Agranulocytes - thymus gland, and upon exposure to thymosin...

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Agranulocytes,  the second group of leukocytes, do not have visible granules in  the cytoplasm and the nucleus is not lobed. There are two types of these  leukocytes:  Lymphocytes,  often classified as small, medium, and large, have a roughly  round nucleus surrounded by a small amount of blue-staining cytoplasm.  Lymphocytes are the only leukocytes that return to the bloodstream,  circulating among the bloodstream, tissue fluids, tissues, and lymph fluid.  There are two major groups of lymphocytes, which vary based upon their  role in an immune response. T lymphocytes (  T cells ), which mature in the 
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Unformatted text preview: thymus gland, and upon exposure to thymosin attack aberrant cells (such as tumor cells, organ transplant cells, or cells infected by viruses). B lymphocytes (B cells), which mature in the bone marrow, respond to circulating antigens (such as toxins, viruses, or bacteria) by dividing to produce plasma cells, which in turn produce antibodies. Monocytes have a large, kidney-shaped nucleus surrounded by ample blue-gray-staining cytoplasm. When monocytes leave the bloodstream and move into tissues, they enlarge and become macrophages, which engulf microbes and cellular debris....
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