Hypersensitivity Reactions and Immune Responses Quiz
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Questions and Answers

Which effector mechanisms produce Type I hypersensitivity reactions?

  • Neutrophils secreting cytokines
  • IgE antibodies binding to FcRI receptors (correct)
  • IgG antibodies binding to FcRI receptors
  • Effector T cells binding to mast cells

    • Which cells are involved in Type I hypersensitivity?

  • Neutrophils and macrophages
  • B cells and T cells
  • Dendritic cells and NK cells
  • Mast cells, eosinophils, and basophils (correct)

    • What is the role of mast cells in innate immunity?

  • Producing IgE antibodies
  • Phagocytosing pathogens
  • Secreting cytokines to recruit neutrophils and effector T cells (correct)
  • Activating complement system

    • Which antibody has an exceptionally high affinity to FcRI receptors?

    <p>IgE</p> Signup and view all the answers

    How do mast cells become operational in Type I hypersensitivity reactions?

    <p>Through antigen recognition by IgE without needing cell proliferation</p> Signup and view all the answers

    Which receptors are expressed by mast cells, basophils, and eosinophils in Type I hypersensitivity?

    <p>Toll-like receptors and Fc receptors for IgA and IgG</p> Signup and view all the answers

    Which statement about Type I hypersensitivity is correct?

    <p>It leads to immediate cell activation upon antigen binding to IgE</p> Signup and view all the answers

    What is the function of FcRI receptors in Type I hypersensitivity?

    <p>'Locking' with antigens to activate mast cells</p> Signup and view all the answers

    Which of the following statements about hypersensitivity reactions is accurate?

    <p>Type III hypersensitivity reactions result in immediate cell release of mediators.</p> Signup and view all the answers

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