Allergy and Hypersensitivity Reactions
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Questions and Answers

What is the primary result of an anaphylactic reaction?

  • Systemic shock and impaired air exchange (correct)
  • Localized tissue damage
  • Decreased smooth muscle contraction
  • Increased capillary permeability

What type of hypersensitivity involves IgE antibodies and mast cells?

  • Type I hypersensitivity (correct)
  • Atopy
  • Type II hypersensitivity
  • Type III hypersensitivity

What is the typical time frame for an anaphylactic reaction to occur?

  • Within 1-2 hours
  • Immediate, within 2 minutes
  • Within 1-3 hours
  • Within 2-30 minutes (correct)

What is the role of IgE antibodies in hypersensitive reactions?

<p>To stimulate mast cell degranulation (C)</p> Signup and view all the answers

What is the difference between Type I and Type II hypersensitivities?

<p>Type I involves IgE, while Type II involves IgG and IgM (D)</p> Signup and view all the answers

What is the primary cause of atopy?

<p>Genetic predisposition (A)</p> Signup and view all the answers

What is the result of the activation of complement in Type III Hypersensitivity reactions?

<p>Release of tissue damaging enzymes (D)</p> Signup and view all the answers

What type of diseases are caused by Type III Hypersensitivity reactions?

<p>Vasculitis, glomerulonephritis, and arthritis (B)</p> Signup and view all the answers

What is the role of IgG and IgM in Type III Hypersensitivity reactions?

<p>They bind to antigen and form immune complexes (C)</p> Signup and view all the answers

What is the outcome of the accumulation of immune complexes in host tissues?

<p>Damage to host tissues (C)</p> Signup and view all the answers

What is the characteristic of Chronic Immune Complex disease?

<p>Persistent infection with weak antibody response (D)</p> Signup and view all the answers

How long does it take for Type III Hypersensitivity reactions to occur?

<p>1-3 hours (B)</p> Signup and view all the answers

What is the term for immune system responses that are harmful and produce tissue injury?

<p>Hypersensitivity reactions (C)</p> Signup and view all the answers

What is the term for an overreaction to an antigen that can cause asphyxiation, vomiting, diarrhea, or even death?

<p>Anaphylactic reaction (D)</p> Signup and view all the answers

What is the type of hypersensitivity reaction characterized by a delay in symptoms of several days?

<p>Delayed hypersensitivity (B)</p> Signup and view all the answers

What type of hypersensitivity reaction is triggered by allergens and involves the production of IgE?

<p>Type I hypersensitivity (C)</p> Signup and view all the answers

What is the term for people who have a hereditary predisposition to develop immediate hypersensitivity reactions against common environmental antigens?

<p>Atopic individuals (B)</p> Signup and view all the answers

What is the result of cross-linking of IgE on sensitized cells in a Type I hypersensitivity reaction?

<p>Degranulation and release of vasoactive amines (A)</p> Signup and view all the answers

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