HYPERSENSITIVITY REACTIONS QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT ANSWERS) /ALREADY GRADED A+

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HYPERSENSITIVITY REACTIONS QUESTIONS WITH
DETAILED VERIFIED ANSWERS (100% CORRECT
ANSWERS) /ALREADY GRADED A+
Quiz: What are the 4 types of hypersensitivity reactions

Ans: 1. Type I (Anaphylactic Reactions)
2. Type 2 (Cytotoxic Reactions)
3. Type 3 (Immune Complex Reactions)
4. Type 4 (Cell-Mediated or Delayed-type Reactions)



Quiz: Type I ( Anaphylatic) Hypersensitivity

a. Time before chemical signs

b. Characteristics

c. Examples

Ans: a. Less then 30 minutes immediate
b. IgE binds to mast cells; this causes degranulation of the mast cell and
release of histamine (reactive)
c. examples
*Anaphylactic shock from drug injections & insect venom
*allergic conditions (hay fever, asthma)



Quiz: Type 2 (Cytotoxic) Hypersensitivity

a. Time before chemical signs

b. Characteristics

c. Examplebs

, Ans: a. 5-12 hours
b. Antigen causes formation of IgM & IgG antibodies that bind to the target
cell; when combined with action of complement destroys target cell
c. examples
* Transfusion reaction (IgM-agglutination)
*Rh incompatibility (IgG cross placenta)



Quiz: Type III ( Immune Complex) Hypersensitivity

a. Time before chemical signs

b. Characteristics

c. Examples

Ans: a. 3-8 hrs
b. Antibodies & antigens form complexes that cause damaging inflammation
c. Examples
*Arthus reaction
* Serum sickness



Quiz: Type IV (Cell-mediated or delayed type) Hypersensitivity

a. Time before chemical signs

b. Characteristics

c. Examples

Ans: a.24-48 hrs
b. Antigens activate Tc that kill target cells
c. Examples
*Rejection of transplanted tissues contact DERMATITIS (Poision Ivy)
* Chronic diseases (Tuberculosis)




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