PP. 957-960.  Fights pathogens to prevent infections and disease.

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Presentation transcript:

PP

 Fights pathogens to prevent infections and disease

 Works with the lymphatic system (collects fluid and returns it to the blood)

 Bone marrow: produces blood cells  Lymphocytes: white blood cells (wbc)

 Bone marrow: produces blood cells  Lymphocytes: white blood cells (wbc)  Lymph nodes: stores wbc  Thymus: matures wbc

 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

 Antigen: any substance that the immune system responds to.

 Antigen: any substance that the immune system responds to.  pathogens: cause disease

 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)

 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

 Protects body against any pathogen, regardless of the pathogen’s identity.

 Skin  Block entry  Toxic-Sweat & Oil

 Skin  Block entry  Toxic-Sweat & Oil  mucous membranes  Mucous-traps pathogens  Cilia-moves pathogens out of body

 Skin  Block entry  Toxic-Sweat & Oil  mucous membranes  Mucous-traps pathogens  Cilia-moves pathogens out of body  stomach acids  destroys pathogens

 Inflammatory response

1.Injured cells release a chemical signal called histamine to increase blood flow to area

 Inflammatory response 1.Injured cells release a chemical signal called histamine to increase blood flow to area 2.Platelets cause clotting trapping pathogens

 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

 interferons: enzymes that stop virus protein production

 fever: slow growth of bacteria and increase activity of wbc  Should a fever always be treated? Why or why not?

 Your body has many different types of lymphocytes (WBC)

 Types of Phagocytes (engulf)  Neutrophils: Ingest pathogens

 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