401002 Lecture Notes - Lecture 18: Adipose Tissue, Clonal Selection, Antigen

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The lymphatic system consists of a conducting network of lymphatic vessels, lymphoid organs, lymphoid tissues, and the circulating lymph. The primary (or central) lymphoid organs generate lymphocytes from immature progenitor cells. The thymus and the bone marrow constitute the primary lymphoid organs involved in the production and early clonal selection of lymphocyte tissues. Bone marrow is responsible for both the creation of t cells and the production and maturation of b cells which are important cell types of the immune system. From the bone marrow, b cells immediately join the circulatory system and travel to secondary lymphoid organs in search of pathogens. T cells, on the other hand, travel from the bone marrow to the thymus, where they develop further and mature. The other 95% of t cells begin a process of apoptisis, a form of programmed cell death. The thymus increases in size from birth in response to postnatal antigen stimulation.

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