第4节免疫调节第二课时（Fourth section immunity adjustment second hours）.docVIP

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第4节免疫调节第二课时（Fourth section immunity adjustment second hours）.doc

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第4节免疫调节第二课时（Fourth section immunity adjustment second hours）

第4节免疫调节第二课时（Fourth section immunity adjustment second hours） Second hours Introducing new lessons Teachers and students, good! In the last lesson, we learned part of the regulation of immunity. Lets recall the main content. Courseware display: 1. what are the components of the immune system? What are their functions? What are included? 2. what are the three lines of defense in the human body? What are nonspecific immunity and which are specific immunity? 3. what are the two specific forms of specific immunity? Choose one of them to explain its function. The 1 immune system is composed of three parts: immune organ, immune cell and immune active substance. The immune organ is the site where the immune cells develop, mature, or concentrate. The immune organs of the human body include tonsils, lymph nodes, thymus, spleen and bone marrow. The cells are playing a role in the immune cells, including macrophages and in lymph, blood and lymph node lymphocytes and lymphocytes in the thymus is divided into mature T cells and mature B cells in bone marrow. A substance produced by an immune cell or other cell that acts as an immune agent; an immunocompetent substance. It includes antibodies, lymph factors, lysozyme, and so on. The 2 skin and mucous membranes form the first line of defense, and the bactericidal substances and phagocytes in the body fluids are the second line of defense. These two lines of defense are non-specific immunity. The third line of defense consists of immune organs and immune cells, which is composed of blood circulation and lymph circulation, and belongs to specific immunity. 3 specific immunity includes humoral and cellular immunity in two ways. Take humoral immunity as an example, after the pathogen passes through the uptake and treatment of phagocytes, it exposes the epitopes and passes the antibodies to T cells. T cells transmit antigens to B cells, and a small number of antigens stimulate B cells directly. A small fraction of B cells are stimulat