1
Exam 2: Hypersensitivity, Exam 2:
Autoimmunity, Exam 2: HIV/AIDS
Questions and Answers (100%
Correct Answers) Already Graded A+
Antigenic response beyond normal. Occurs when sensitized by
© 2026 Assignment
previous exposure to
Guru01 - Stuvia
an antigen (allergen)— Ans: Hypersensitivity
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
© 2026 Assignment
shock)
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
Exam 2: Hypersensitivity, Exam 2:
Autoimmunity, Exam 2: HIV/AIDS
Questions and Answers (100%
Correct Answers) Already Graded A+
Antigenic response beyond normal. Occurs when sensitized by
© 2026 Assignment
previous exposure to
Guru01 - Stuvia
an antigen (allergen)— Ans: Hypersensitivity
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
© 2026 Assignment
shock)
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
