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The Role of B and T cells in specific defense mechanisms. The immune system has various systems to combat disease, including chemokines, antibodies and cells. The 'cell' group is divided into 3 sub-groups consisting of granulocytes, macrophages and lymphocytes. Lymphocytes exist in two major kinds: T cells and B cells. Lymphocytes are arguably the most important aspect of the immune response; they are responsible for immunity, they coordinate the destruction of foreign cells and pathogens; they are the reason why vaccines work. Lymphocytes are commonly called white blood cells, and they are produced in the bone marrow. Above: B-lymphocyte. B-lymphocytes constitute 30% of all lymphocytes in the body. They are responsible for active immunity, because their direct descendants (called plasma cells) have the ability to respond to any antigens that the parent cell encountered. This is achieved because the cells reproduce by mitosis, i.e. all the daughter cells are identical...

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