lecture_3_immune_function-and_behavious

lecture_3_immune_function-and_behavious - Immune System The...

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    Immune System
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The Immune System Antigens  are any substance (e.g., bacterial,  viral, fungi) that can trigger an immune  response. Bacterial  – microorganisms in the  environment. Grow rapidly and compete with  our cells for nutrients. Fungi  – organisms like mould and yeast.   Also, absorbs nutrients. Viruses  – proteins and nucleic acid.  They  take over the cell and generate their own  genetic instructions.
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Immune System Immune system recognizes itself and  foreign material Transplant success can by increased  by: Using close genetic tissue match. Using medications that inhibit the immune  system’s attack on the foreign material.
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Immune System Allergies are immune response to  (normally) harmless substances. Allergins are substances that trigger an  allergic response (e.g., pollen, cat  dander)
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Organs of the Immune System Lymphatic and lymphoid organs Deploys lymphocytes Lymphocytes White blood cell that provides main  defense against foreign material Produced by bone marrow
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Organs of the Immune System Lymph Nodes Bean-shaped spongy tissue Largest are in the neck, arm-pit, abdomen, and  groan Filters to capture antigens (foreign material) and  has compartments for lymphocytes. Lymph vessels Connects to lymph nodes and carries fluid called  lymph into the blood stream
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Organs of the Immune System Lymphocytes Form of white blood cells that provide main  defense against foreign matter Lymphocytes originate from bone  marrow
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Organs of the Immune System Spleen Upper left side of the abdomen Filters antigens that the lymph vessels put  into the bloodstream Home base for white blood cells Removes worn out red blood cells
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Organs of the Immune System Phagocytes Engulf and ingest antigens Two types: Macrophages – attach to tissue and stay  there Monocytes – circulate in the blood Nonspecific immune processes
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Specific Immune Processes  Cell-mediated immunity Killer t-cells (CD8) – destroy foreign  tissue, cancerous cells, cells invaded by  antigens Memory t-cells – remember previous  antigen in order to defend against  subsequent invasions.
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lecture_3_immune_function-and_behavious - Immune System The...

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