chapter 35 edited

chapter 35 edited - Immunity Chapter 35 Smallpox 35.1 The...

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Immunity Chapter 35
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Smallpox
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35.1 The Body’s Defenses Immunity Capacity to resist and combat infection Three lines of defense Surface barriers Innate immune system Adaptive immune system
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Innate Immune Response Innate immune response A set of general defenses that in most cases can prevent infection from becoming established Antigens Any molecule or particle that is recognized as foreign and triggers the innate immune response
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Adaptive Immune Response White blood cells ( leukocytes ) target and destroy specific threats Various signaling molecules integrate activities of the two responses Complement proteins Cytokines
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White Blood Cells
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Key Concepts: OVERVIEW OF BODY DEFENSES The vertebrate body has three lines of defense against threats to health Surface barriers can prevent invasion of internal tissues by ever-present pathogens
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Key Concepts: OVERVIEW OF BODY DEFENSES (cont.) Innate immune response rids the body of most invaders before infection becomes established Adaptive immune responses target specific pathogens and cancer cells
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35.2 Barriers at Body Surfaces Microbes on surfaces don’t cause disease unless they penetrate inner tissues Physical barriers: Skin and linings of the body’s tubes and cavities Mechanical barriers: Sticky mucus, ciliated cells, flushing action of urination and diarrhea Chemical barriers: Secretions of established populations of resident microbes and lysozyme
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Microbes on Human Surfaces
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Vertebrate Surface Barriers
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Key Concepts: SURFACE BARRIERS The first line of defense Skin, mucous membranes, and secretions at the body’s surfaces function as barriers that exclude most microbes
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35.3 Innate Immune Responses
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chapter 35 edited - Immunity Chapter 35 Smallpox 35.1 The...

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