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Actually, lymphocytes are found all over the body, except in brain and joints unless in disease. They occur in lymphoid organs....T lymphocytes in thymus and B lymphocytes in spleen, for example. There are many types which are found in different sites in the body, depending on their function. There are specialised region in the lungs (BALT) and small intestine (GALT) where they are very important.
Lymphocytes are produced by precursor cells in the bone marrow. They are found traveling in the blood stream, at sites of infection in large numbers, and in the lymph nodes which are located in the groin area, armpit area, and tonsils. There are also lymphocytes in the appendix and spleen.
One important type of white blood cell is a lymphocyte. These are made in the marrow of your bones. You may have as many as 2 trillion lymphocytes in your bloodstream at any one time. Two major types of lymphocytes involved in protecting the body against invaders are T lymphocyte cells and B lymphocyte cells. T lymphocyte cells destroy cells that have been infected or damaged by the antigens. B lymphocytes are found in immunity-related organs such as the lymph nodes. They direct the making of immunoglobulin E, called IgE. IgE is a special disease-fighting protein known as an antibody. It binds to an antigen in your body, such as bacteria, rendering it harmless. (http://health.discovery.com/centers/articles/articles.html?chrome=c16&article=LC_07¢er=p01)
"B lymphocytes are found in immunity-related organs such as the lymph nodes. They direct the making of immunoglobulin E, called IgE. IgE is a special disease-fighting protein known as an antibody."
I'm sorry, this is just wrong. IgM is the first antibody produced by all B lymphocytes, followed by others such as IgG. IgE is a specialised antibody produced in only some situations, such as parasitic infections.
Lymphocytes are white blood cells. There are different types of white blood cells. They are monocytes, lymphocytes and granulocytes. Lymphocytes are smaller than granulocytes and have a round nucleus. They are made in the lymph nodes and spleen. They also make antibodies which are resistant against antigens. Lymphocytes are distributed along the whole body by means of blood, which contains the lymphocytes. The shortest answer for your question is "in blood" If u have interest in sciences and GCSE exam, i recommend you these sites.
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