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Lecture

Immune system.docx

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Department
Biology
Course
BIOL 301
Professor
Vivian Dayeh
Semester
Winter

Description
Immune system ­ lymphocytes are found in lymphoid tissue and lymphoid organs  ­ lymph nodes fight pathogens  ­ one branch of immune system recognizes specific foreign molcules: adaptive,  acquired, or specific immune response  o key cells are lymphocytes(a type of WBC) o leukocytes with access to the lymph system: B cells, T cells,  NK(natural killer) cells  ­ also includes lymphoid tissue and lymphoid organs o lymphoid organs: bone marrow, lymph nodes, spleen, thymus,  tonsils, aggregated lymphoid nodules in small intestine and  appendix  Lymphoid tissue Lymphoid organs  Most important tissue of immune  Primary lymphoid organs: developing  system lymphocytes Specialized type of CT where  Secondary lymphoid organs: designed to  lymphocytes gather to fight  gather and destroy infectious  microorganisms and to store lymphocytes Locations:  1. Frequently in
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