Human defence system

Immunity=the ability to resist infection
1. General defence system acts as a barrier to all pathogens
  1. First line of defence: skin, clotting,lysozyme, mucus, cilia, acid, beneficial bacteria
    1. Second line of general defence: Phagocytic white blood cells
      1. Large phagocytes are called macrophages - they surround and ingest pathogens
      2. Defence proteins: COMPLEMENT (destroys viruses) AND INTERFERON (prevent viral multiplication)
      3. Inflammation - brings white blood cells to area and causes fever
2. Specific defence system attacks particular pathogens
  1. Monocytes
    Anmerkungen:
    - m
  2. Production of antibodies by Lymphocytes
    1. An antibody is a protein produced by white blood cells in response to a specific antigen
      1. An antigen is a foreign molecule that stimulates the production of antibodies
What is induced immunity?
1. The ability to resist disease caused by specific pathogens by the production of antibodies
  1. Active Immunity - the production of a person's own antibodies in response to foreigh antigens that enter the body
    1. Natural active immunity e.g. getting chickenpox
    2. Artificial active immunity is when a pathogen is medically introduced into the body -VACCINATION
      1. A vaccine is a non disease-causing dose of a pathogen or its toxin which triggers the production of antibodies
  2. Passive Immunity
    1. When individuals are given antibodies that were formed by another organism
      1. Natural passive immunity: child gets antibodies from mother across placenta or from breast milk
      2. Artificial passive immunity is when a person is given an injection containing antibodies made by another organism e.g. anti-tetanus injection

Nächster

Human defence system

Beschreibung

Zusammenfassung der Ressource

Medienanhänge

ähnlicher Inhalt

	Erstellt von Jane O'Connell vor fast 8 Jahre