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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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- Spring '10