a type of white blood cells which are the most important cells in the immune system [ Top ]
Small white blood cells that help the body defend itself against infection These cells are produced in bone marrow and develop into plasma cells, which produce antibodies Also known as B cells
Type of white blood cell, found in blood, lymph nodes, spleen, and bone marrow, that forms the immune system that guards individuals against attack by foreign tissue, viruses, and most microorganisms
White blood cells formed in the body's lymphoid tissue The nucleus is round or ovoid with coarse, irregularly clumped chromatin while the cytoplasm is typically pale blue with azurophilic (if any) granules Most lymphocytes can be classified as either T or B (with subpopulations of each); those with characteristics of neither major class are called null cells
Small white blood cells that are important to the immune system A decline in lymphocyte function with advancing age is being studied for insights into aging and disease
Small white cells, normally present in the blood and in lymphoid tissue, that bear the major responsibility for carrying out the functions of the immune System There are two major forms of lymphocytes, B-cells and T-cells, which have distinct though related functions in generating an immune response
20-35% of leukocytes - Lymphocytes are manufactured in the lymph tissues, and depending on whether they have differentiated during fetal development in the bone marrow as B cells or in the thymus as T cells, they perform specific roles, reacting to specific antigens, throughout life The process of differentiation is a time when each lymphocyte receives cell surface markers, which ensure that it will react against one and only one kind of foreign antigen; at the same time each lymphocyte learns not to react to the body's own cells Millions of such B and T lymphocytes are "trained" during fetal development When an individual comes in contact with an antigen and the antigen attaches to B and T lymphocytes that have the antigen's cell surface markers, these lymphocytes becomes activated
A type of white blood cell that is primarily responsible for the immune response; includes T cells and B cells
Cells of the immune system that respond specifically to foreign antigens There are two classes of lymphocytes: B-lymphocytes (B-cells) and T-lymphocytes (T-cells) They are found in blood, lymph, and lymphoid tissues B-cells become memory or plasma cells T-cells differentiate into several types: helper (CD4 T-cells); suppressor (CD4 and CD8 T-cells); cytotoxic (CD4 and CD8 T-cells); and memory (CD4 and CD8-T-cells)
(LIM-fo-sites): White blood cells Lymphocytes have a number of roles in the immune system, including the production of antibodies and other substances that fight infection and other diseases
part of the lymphatic system; white blood cells that fight infection and disease
Small white blood cells produced in the lymphoid organs and paramount in the immune defenses (Read about "The Lymph System")
Any of the nearly colorless cells formed in lymphoid tissue, as in the lymph nodes, spleen, thymus, and tonsils, constituting between 22 and 28 percent of all white blood cells in the blood of a normal adult human being They function in the development of immunity and include two specific types,B cells and T cells