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Histology Guide What louis vuitton briefcase ebay uk are Primary lymphatic organs? Primary lymphatic organs are where lymphocytes are formed louis vuitton alma orange and mature.
They provide an environment for stem cells to divide and mature into B and T cells: There are two primary lymphatic organs: the red bone marrow and the thymus gland. The development of white blood cells (haemopoesis) was louis vuitton bracelet men covered briefly in the section on blood. Both T cell and B cells are 'born' in the bone marrow. However, whereas B cells also mature louis vuitton a la folie bracelet in the bone marrow, T cells have to migrate to the thymus, which is where they mature in the thymus. Filtering Tissue Fluid Tissue fluid is filtered by non encapsulated (or partially encapsulated) aggregations of lymphoid tissue (sometimes called Mucosa Associated Lymphoid Tissue (MALT)). This makes up 85% of lymphoid tissue, in the non sterile mucosa. They are usually small, around 1mm in diameter, with the exceptions beting the tonsils, peyers patches and the appendix. Although the epithelia of these tissues has mechanisms to keep bacteria etc out of the body, this is not foolproof. Thus the lymphoid cells in these areas are able to respond to any bacteria or micro organisms that do get through the epithelia. Activated B cells in these areas can develop into plasma cells, and produce antibodies, in situ.
Lymphocytes from the larger permanent organs (such as the tonsils) are able to patrol the surrounding tissue, and quickly respond to foreign antigens. Tonsils are large partially encapsulated masses of lymphoid tissue, found in the walls of the pharynx and nasopharynx, and at the base of the tongue. They form an incomplete ring around the gastrointestinal and respiratory tracts, where they cross over.
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