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Immune System Alayna Dixon Period 3 Anatomy and Physiology - Coggle…

- - - - Engulfment and digestion of pathogens, foreign particles, and
        debris
    - - Defend the body against viruses and cancer cells by secreting cytolytic substances called perforins, which lyse (break apart) cell membranes of pathogens
    - - Chemicals that kill many pathogens with their acidic environments, enzymes and interferons
    - - Function of inflammation is to stop the spread of pathogens
        and infection
    - - Mechanical barriers represent the body’s first line of defense
- - - - Cells that memorize the pathogens antigen so that the immune response if it appears again is much faster and efficient by launching aa many cytotoxic T cells.
    - - monitor the body's cells, recognizing and
        eliminating cancer cells and virus-infected cells
    - - Helper T cells aid in the activation of macrophages and B cells
  - - - Similarly to memory T cells, memory B cells memorize the antigen present on the pathogen in order to launch an attack against it should it show up again, more fast and efficient and they stay dormant until it recognizes the antigen on the pathogen
- - - - Mucous Membranes
      - Skin
      - Prevent the entry of certain pathogens by providing a physical
        separation of pathogens and internal tissues
  - - - Acidic environment provided by HCl in gastric juice is lethal to
        some pathogens
      - Enzymes, such as pepsin in the stomach and lysozyme in tears,
        destroy many pathogens
      - Interferons, hormone-like peptides secreted by lymphocytes and fibroblasts when viruses or tumor cells are present, block viral replication and slow tumor growth