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Introduction to Hypersensitivites quiz

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  • What is an immunological disorder?
    An immunological disorder is a condition caused by dysfunction of the immune system, which may be too strong, too weak, or misdirected.
  • What are the four main categories of immunological disorders?
    The four main categories are hypersensitivities, autoimmune disorders, immunodeficiency disorders, and transplant rejections.
  • What is hypersensitivity in the context of immunological disorders?
    Hypersensitivity is an exaggerated, harmful immune system overreaction that occurs after sensitization to an antigen.
  • What does the term 'sensitization' mean in hypersensitivity reactions?
    Sensitization is the immune system's first exposure to an antigen, preparing it to react in subsequent exposures but not causing a response on the first exposure.
  • Which hypersensitivity type is most commonly associated with allergic reactions?
    Type I hypersensitivity is most commonly associated with allergic reactions and is mediated by IgE antibodies.
  • What is the main mechanism of Type II hypersensitivity?
    Type II hypersensitivity involves antibodies binding to antigens on cell surfaces, leading to cytotoxic cell death.
  • What is a classic example of Type II hypersensitivity?
    A classic example is hemolytic transfusion reactions caused by improper blood transfusions.
  • What causes Type III hypersensitivity reactions?
    Type III hypersensitivity is caused by the formation and accumulation of immune complexes, leading to inflammation.
  • Which disease is a classic example of Type III hypersensitivity?
    Rheumatoid arthritis is a classic example, where immune complexes accumulate in the joints and cause inflammation.
  • How are Type IV hypersensitivity reactions different from Types I-III?
    Type IV hypersensitivity is mediated by T cells and is delayed, unlike Types I-III, which are mediated by antibodies.
  • What is a classic example of Type IV hypersensitivity?
    A classic example is the rash caused by contact with poison ivy.
  • What does the acronym 'ACID' help you remember about hypersensitivity types?
    ACID stands for Allergic (Type I), Cytotoxic (Type II), Immune complex (Type III), and Delayed cell-mediated (Type IV) hypersensitivities.
  • Do hypersensitivity reactions occur on the first exposure to an antigen?
    No, hypersensitivity reactions occur only after sensitization, not on the first exposure.
  • What factors contribute to the development of hypersensitivities?
    Hypersensitivities arise from a combination of genetic and environmental factors.
  • How are hypersensitivities related to autoimmune diseases and transplant rejections?
    Many autoimmune disorders and transplant rejections result from hypersensitivity reactions, showing their interconnectedness.