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PP. 957-960 Slide 2 Fights pathogens to prevent infections and disease Slide 3 Works with the lymphatic system (collects fluid and returns it to the blood) Slide 4 Bone marrow: produces blood cells Lymphocytes: white blood cells (wbc) Slide 5 Bone marrow: produces blood cells Lymphocytes: white blood cells (wbc) Lymph nodes: stores wbc Thymus: matures wbc Slide 6 Bone marrow: produces blood cells Lymphocytes: white blood cells (wbc) Lymph nodes: stores wbc Thymus: matures wbc Spleen: contains wbc that clean out pathogens as blood filters through Slide 7 Antigen: any substance that the immune system responds to. Slide 8 Antigen: any substance that the immune system responds to. pathogens: cause disease Slide 9 Antigen: any substance that the immune system responds to. pathogens: cause disease 1. viruses: protein shell containing DNA or RNA 2. Bacteria 3. Fungi (spores) 4. Parasites 5. Toxins (snake bites etc) Slide 10 Antigen: any substance that the immune system responds to. pathogens: cause disease 1. viruses: protein shell containing DNA or RNA 2. Bacteria 3. Fungi (spores) 4. Parasites 5. Toxins (snake bites etc) Allergens: Cause allergies (pollen etc.) Put Your Hands Together Put Your Hands Together Slide 11 Protects body against any pathogen, regardless of the pathogens identity. Slide 12 Skin Block entry Toxic-Sweat & Oil Slide 13 Skin Block entry Toxic-Sweat & Oil mucous membranes Mucous-traps pathogens Cilia-moves pathogens out of body Slide 14 Skin Block entry Toxic-Sweat & Oil mucous membranes Mucous-traps pathogens Cilia-moves pathogens out of body stomach acids destroys pathogens Slide 15 Inflammatory response Slide 16 1.Injured cells release a chemical signal called histamine to increase blood flow to area Slide 17 Inflammatory response 1.Injured cells release a chemical signal called histamine to increase blood flow to area 2.Platelets cause clotting trapping pathogens Slide 18 Inflammatory response 1.Injured cells release a chemical signal called histamine to increase blood flow to area 2.Platelets cause clotting trapping pathogens 3.Area swells, becomes warm, and macrophages/phagocyte (wbc) move in and engulf bacteria Slide 19 interferons: enzymes that stop virus protein production Slide 20 fever: slow growth of bacteria and increase activity of wbc Should a fever always be treated? Why or why not? Slide 21 Your body has many different types of lymphocytes (WBC) Slide 22 Types of Phagocytes (engulf) Neutrophils: Ingest pathogens Slide 23 Your body has many different types of lymphocytes (WBC) Types of Phagocytes (engulf) Neutrophils: Ingest pathogens Macrophage: Engulf pathogens & other cell debris Natural Killer Cells: Burst pathogen infected cells