11-13-06 (Guest Speaker)

11-13-06 (Guest Speaker) - The Immune System a network of...

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The Immune System; a network of cells and organs that has evolved to defend the body against attacks by “foreign” invaders. Can distinguish between: Distinctive molecules on your body’s cells identify them as belonging to you (self) Foreign molecules carry distinctive markers that identify them as “non-self” or foreign material. Antigen; specific marker that triggers the immune response. Can be from foreign substances or self. Antibody; specific protein produced by white blood cells in response to an antigen. Recognizes and destroys specific invader containing the antigen. Pathogen; organism or microbe that enters the body and causes disease. Infection; disease cause by pathogen. First Line of Defense Skin- physical barrier Respiratory tract- mucous, cilia, coughing, sneezing Mucous, tears, saliva, sweat, gastric juices. Lymphatic System Transport of lymph fluid (tissue fluid) Transport of dietary fat Development, storage, deployment of immune cells. Filtration of immune “debris.” Enlarged lymph nodes usually indicate infection. White Blood Cells Phagocytes; Macrophages (big eaters), dendritic cells, neutrophils, monocytes. Macrophages reside in tissue throughout the body. Lymphocytes T-Cells: Destroy infected cells AND coordinate the immune response. Produce Cytokines (chemical messengers)
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11-13-06 (Guest Speaker) - The Immune System a network of...

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