Chapter 21 The Immune System BB Version

Antigens pathogens immobilizes neutralizes or destroys

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Unformatted text preview: tigen Aspects of the adaptive immune system system It is antigen specific Reaction against particular antigens that Reaction initiate the immune response initiate It is systemic Occurring throughout the body, rather than Occurring locally locally It has a memory Reacting stronger and faster the second time Reacting a pathogen is encountered pathogen Two systems Two Humoral, antibody mediated immunity Antibodies in the body fluids, produced by Antibodies lymphocytes, bind to antigens and mark them for destruction by phagocytes destruction Cellular, cell mediated immunity Lymphocytes defend themselves directly Directly: lysing foreign cells Indirectly: release chemical mediators What is an Antigen? What Any foreign substance in the body that Any mobilize an immune response mobilize They are the target of the immune system Often large, complex molecules Termed: NONSELF Complete antigens and haptens Complete Complete antigen Immunogenicity: stimulates proliferation of specific Immunogenicity: lymphocytes and antibodies lymphocytes Reactivity: Have the ability to react to the activated Reactivity: lymphocytes and antibodies lymphocytes Hapten Small molecules (hormones, peptides, etc.) causing Small an allergic reaction an Mount an attack once linked to bodies defenses Antibody A Antigenbinding sites...
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