1
Hypersensitivity Exam 2: Questions
and Answers (100% Correct
Answers) Already Graded A+
Antigenic response beyond normal. Occurs when sensitized by
previous exposure to
© 2026 Assignment
an antigen (allergen) Ans: Hypersensitivity
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Expert
Hypersensitivity Type I Ans: Anaphylactic Reactions
Hypersensitivity Type II Ans: Cytotoxic Reactions
Hypersensitivity Type III Ans: Immune Complex Reactions
Hypersensitivity Type IV Ans: Delayed (Cell-Mediated)
Reactions
Occurs minutes after a person sensitized to an antigen is re-
exposed to that antigen Ans: Anaphylactic Reactions
Antigens combine with IgE antibodies, IgE attaches to mast
cells and basophils, which undergo degranulation, releasing
mediators Ans: Anaphylactic Reactions
Increases the permeability of blood capillaries (Least potent)
Ans: Histamine
Cause prolonged contraction of smooth
, 2
muscles (most potent) Ans: Leukotrienes
Not present in granules, need to be synthesized first Ans:
Leukotrienes, Prostaglandins
Affect smooth muscle and increase mucus secretion (more
potent) Ans: Prostaglandins
May result in circulatory collapse and death. Treated with
epinephrine Ans: Systemic anaphylaxis (anaphylactic shock)
© 2026 Assignment
Can be triggered by cytokines IL-1 and TNF-α Ans: Systemic
Guru01 - Stuvia
anaphylaxis (anaphylactic shock)
Expert
Usually associated with ingested or inhaled antigens.
Symptoms depend on the route of entry (Hives, hay fever, and
asthma) Ans: Localized anaphylaxis
Increasing dosages of antigen injected beneath the skin Ans:
Desensitization
Produces IgG, which act as blocking antibodies to intercept
and neutralize allergic antigens Ans: Desensitization
Activation of complement by the combination of IgG or IgM
antibodies with an antigenic cell. Causes cell lysis or damage
by macrophages Ans: Cytotoxic Reactions
ABO blood group system is an example of Ans: Cytotoxic
Reactions
Antibodies form against certain carbohydrate antigens on RBCs
Ans: ABO blood group system
Hypersensitivity Exam 2: Questions
and Answers (100% Correct
Answers) Already Graded A+
Antigenic response beyond normal. Occurs when sensitized by
previous exposure to
© 2026 Assignment
an antigen (allergen) Ans: Hypersensitivity
Guru01 - Stuvia
Expert
Hypersensitivity Type I Ans: Anaphylactic Reactions
Hypersensitivity Type II Ans: Cytotoxic Reactions
Hypersensitivity Type III Ans: Immune Complex Reactions
Hypersensitivity Type IV Ans: Delayed (Cell-Mediated)
Reactions
Occurs minutes after a person sensitized to an antigen is re-
exposed to that antigen Ans: Anaphylactic Reactions
Antigens combine with IgE antibodies, IgE attaches to mast
cells and basophils, which undergo degranulation, releasing
mediators Ans: Anaphylactic Reactions
Increases the permeability of blood capillaries (Least potent)
Ans: Histamine
Cause prolonged contraction of smooth
, 2
muscles (most potent) Ans: Leukotrienes
Not present in granules, need to be synthesized first Ans:
Leukotrienes, Prostaglandins
Affect smooth muscle and increase mucus secretion (more
potent) Ans: Prostaglandins
May result in circulatory collapse and death. Treated with
epinephrine Ans: Systemic anaphylaxis (anaphylactic shock)
© 2026 Assignment
Can be triggered by cytokines IL-1 and TNF-α Ans: Systemic
Guru01 - Stuvia
anaphylaxis (anaphylactic shock)
Expert
Usually associated with ingested or inhaled antigens.
Symptoms depend on the route of entry (Hives, hay fever, and
asthma) Ans: Localized anaphylaxis
Increasing dosages of antigen injected beneath the skin Ans:
Desensitization
Produces IgG, which act as blocking antibodies to intercept
and neutralize allergic antigens Ans: Desensitization
Activation of complement by the combination of IgG or IgM
antibodies with an antigenic cell. Causes cell lysis or damage
by macrophages Ans: Cytotoxic Reactions
ABO blood group system is an example of Ans: Cytotoxic
Reactions
Antibodies form against certain carbohydrate antigens on RBCs
Ans: ABO blood group system
