NATS 1670 Chapter Notes -Anatta, Natural Killer Cell, Lactobacillus
Document Summary
January 3 2012 - immunity and disease pp. Three lines of defense protect the body: the body"s array of physical and chemical barriers to infection. Examples include intact skin and the linings of body cavities and tubes. Immune system: a system of interacting white blood cells that defend the body: known as a cellular system because the white blood cells perform most of the functions. Antigen: a molecule or particle that the immune system recognizes as non-self. Triggers an immune response: most are proteins, lipids or the large sugar molecules called oligosaccharides, all virus particles, foreign cells, toxins and cancer cells have antigens on their surface. Immunity: the body"s overall ability to resist and fight infections. Antigens of pathogens, toxins, proteins on altered body cells. White blood cells and their chemicals are the defenders in immune responses. White blood cells operate in both the innate and adaptive immune responses (all release substances that help muster or strengthen defense responses)