NR507 Advanced Pathophysiology Review Midterm Exam
Actual Exam 2026/2027 | Complete Exam-Style
Questions with Detailed Rationales | Pass Guaranteed –
A+ Graded
Section 1: Immunological Pathologies
Q1: A 24-year-old patient develops sneezing, rhinorrhea, and conjunctival itching within
minutes of exposure to ragweed pollen. The pathophysiologic mechanism involves
IgE-mediated mast cell degranulation and histamine release. This immune reaction is
classified as:
A. Type II cytotoxic hypersensitivity
B. Type III immune complex-mediated hypersensitivity
C. Type I immediate hypersensitivity reaction [CORRECT]
D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: C
Rationale: Correct because Type I hypersensitivity is IgE-mediated, involving mast cell
degranulation and histamine release upon allergen exposure, with prototype diseases
including allergic rhinitis, asthma, and anaphylaxis.
Q2: A patient develops acute bronchospasm and hypotension following a bee sting.
Emergency administration of epinephrine counteracts this reaction primarily through
which mechanism?
A. Mast cell stabilization preventing further degranulation
B. Alpha-1 and beta-2 adrenergic agonism causing vasoconstriction and
bronchodilation [CORRECT]
C. Competitive antagonism of histamine at H1 and H2 receptors
D. Corticosteroid-mediated suppression of inflammatory cytokines
Correct Answer: B
Rationale: Correct because epinephrine acts as an alpha- and beta-adrenergic agonist,
causing vasoconstriction to reverse hypotension and beta-2 agonism to produce
,bronchodilation, counteracting the pathophysiologic effects of IgE-mediated mast cell
degranulation in anaphylaxis.
Q3: In asthma, chronic airway inflammation produces bronchial hyperreactivity, smooth
muscle spasm, and mucus hypersecretion. The resulting effect on alveolar ventilation
is:
A. Increased alveolar ventilation from compensatory mechanisms
B. Decreased alveolar ventilation due to airflow obstruction [CORRECT]
C. Normal alveolar ventilation with preserved gas exchange
D. Increased physiologic dead space without airflow limitation
Correct Answer: B
Rationale: Correct because asthma pathophysiology involves chronic airway
inflammation causing bronchial hyperreactivity, smooth muscle spasm, and mucus
hypersecretion, which produces airflow obstruction and decreased alveolar ventilation.
Q4: A patient with anaphylaxis experiences widespread vasodilation and increased
vascular permeability. These hemodynamic effects result primarily from histamine
binding to:
A. Alpha-1 adrenergic receptors on vascular smooth muscle
B. H1 and H2 histamine receptors on endothelial and smooth muscle cells [CORRECT]
C. Muscarinic M3 receptors on bronchial smooth muscle
D. Beta-2 adrenergic receptors on pulmonary arterioles
Correct Answer: B
Rationale: Correct because histamine released during mast cell degranulation in Type I
hypersensitivity binds H1 receptors causing vascular permeability and
bronchoconstriction, and H2 receptors causing vasodilation and increased gastric acid
secretion.
Q5: A 28-year-old female presents with a malar rash across her cheeks and nasal
bridge, photosensitivity, oral ulcers, and bilateral wrist arthritis. Laboratory studies
reveal positive ANA, elevated anti-dsDNA antibodies, decreased C3 and C4 complement
levels, and urinalysis shows proteinuria with RBC casts. Which pathophysiologic
mechanism best explains the renal involvement in this patient?
A. IgE-mediated mast cell activation causing interstitial nephritis
B. IgG/IgM antibody-mediated destruction of glomerular basement membrane
,C. Antigen-antibody complex deposition in glomerular capillaries causing immune
complex-mediated inflammation [CORRECT]
D. Cytotoxic T-cell direct lysis of renal tubular epithelial cells
Correct Answer: C
Rationale: Correct because lupus nephritis results from Type III hypersensitivity with
antigen-antibody complex deposition in glomerular capillaries, activating complement
and producing immune complex-mediated inflammation, which matches the clinical
presentation of SLE with positive anti-dsDNA and decreased C3/C4.
Q6: A patient with Graves' disease develops hyperthyroidism due to
autoantibody-mediated stimulation of the TSH receptor. This pathophysiologic
mechanism represents:
A. Type I IgE-mediated hypersensitivity
B. Type II cytotoxic antibody-mediated cell stimulation [CORRECT]
C. Type III immune complex deposition
D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: B
Rationale: Correct because Graves' disease represents Type II hypersensitivity involving
IgG autoantibody-mediated stimulation of the TSH receptor, which is a form of
antibody-mediated cytotoxic or stimulatory reaction targeting specific cellular antigens.
Q7: A patient receives a unit of ABO-incompatible blood and develops fever, chills, and
hemoglobinuria within 2 hours. The underlying pathophysiologic mechanism involves
pre-formed IgM and IgG antibodies binding to foreign RBC antigens and activating
complement. This represents:
A. Type I anaphylactic reaction
B. Type II cytotoxic hypersensitivity reaction [CORRECT]
C. Type III immune complex reaction
D. Type IV delayed hypersensitivity reaction
Correct Answer: B
Rationale: Correct because acute hemolytic transfusion reactions represent Type II
hypersensitivity involving pre-formed IgM and IgG antibodies binding to foreign RBC
surface antigens, activating complement and causing intravascular hemolysis.
, Q8: In autoimmune hemolytic anemia, the direct Coombs test is positive. The
pathophysiologic mechanism involves:
A. IgE-mediated mast cell activation and histamine release
B. IgG or IgM antibody-mediated RBC destruction with complement activation
[CORRECT]
C. T-cell mediated direct cellular lysis of erythrocytes
D. Circulating immune complex deposition on erythrocyte membranes
Correct Answer: B
Rationale: Correct because autoimmune hemolytic anemia represents Type II
hypersensitivity with IgG or IgM antibodies binding to RBC surface antigens, leading to
complement activation and extravascular hemolysis, producing a positive direct
Coombs test.
Q9: A patient develops glomerulonephritis three weeks after group A streptococcal
pharyngitis. Renal biopsy reveals subepithelial immune complex deposits. This
pathophysiologic process represents:
A. Type I hypersensitivity with IgE-mediated renal injury
B. Type II cytotoxic antibody-mediated glomerular destruction
C. Type III immune complex-mediated glomerulonephritis [CORRECT]
D. Type IV delayed hypersensitivity with granuloma formation
Correct Answer: C
Rationale: Correct because post-streptococcal glomerulonephritis represents Type III
hypersensitivity with circulating antigen-antibody complexes depositing in glomerular
capillaries, activating complement and producing immune complex-mediated
inflammation.
Q10: A patient with poison ivy contact dermatitis develops erythema, vesicles, and
pruritus 48 hours after exposure. The pathophysiologic mechanism involves sensitized
CD4+ T lymphocytes recognizing processed antigen presented by Langerhans cells.
This represents:
A. Type I immediate hypersensitivity
B. Type II cytotoxic reaction
C. Type III immune complex deposition
D. Type IV delayed T-cell mediated hypersensitivity [CORRECT]
Correct Answer: D
Actual Exam 2026/2027 | Complete Exam-Style
Questions with Detailed Rationales | Pass Guaranteed –
A+ Graded
Section 1: Immunological Pathologies
Q1: A 24-year-old patient develops sneezing, rhinorrhea, and conjunctival itching within
minutes of exposure to ragweed pollen. The pathophysiologic mechanism involves
IgE-mediated mast cell degranulation and histamine release. This immune reaction is
classified as:
A. Type II cytotoxic hypersensitivity
B. Type III immune complex-mediated hypersensitivity
C. Type I immediate hypersensitivity reaction [CORRECT]
D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: C
Rationale: Correct because Type I hypersensitivity is IgE-mediated, involving mast cell
degranulation and histamine release upon allergen exposure, with prototype diseases
including allergic rhinitis, asthma, and anaphylaxis.
Q2: A patient develops acute bronchospasm and hypotension following a bee sting.
Emergency administration of epinephrine counteracts this reaction primarily through
which mechanism?
A. Mast cell stabilization preventing further degranulation
B. Alpha-1 and beta-2 adrenergic agonism causing vasoconstriction and
bronchodilation [CORRECT]
C. Competitive antagonism of histamine at H1 and H2 receptors
D. Corticosteroid-mediated suppression of inflammatory cytokines
Correct Answer: B
Rationale: Correct because epinephrine acts as an alpha- and beta-adrenergic agonist,
causing vasoconstriction to reverse hypotension and beta-2 agonism to produce
,bronchodilation, counteracting the pathophysiologic effects of IgE-mediated mast cell
degranulation in anaphylaxis.
Q3: In asthma, chronic airway inflammation produces bronchial hyperreactivity, smooth
muscle spasm, and mucus hypersecretion. The resulting effect on alveolar ventilation
is:
A. Increased alveolar ventilation from compensatory mechanisms
B. Decreased alveolar ventilation due to airflow obstruction [CORRECT]
C. Normal alveolar ventilation with preserved gas exchange
D. Increased physiologic dead space without airflow limitation
Correct Answer: B
Rationale: Correct because asthma pathophysiology involves chronic airway
inflammation causing bronchial hyperreactivity, smooth muscle spasm, and mucus
hypersecretion, which produces airflow obstruction and decreased alveolar ventilation.
Q4: A patient with anaphylaxis experiences widespread vasodilation and increased
vascular permeability. These hemodynamic effects result primarily from histamine
binding to:
A. Alpha-1 adrenergic receptors on vascular smooth muscle
B. H1 and H2 histamine receptors on endothelial and smooth muscle cells [CORRECT]
C. Muscarinic M3 receptors on bronchial smooth muscle
D. Beta-2 adrenergic receptors on pulmonary arterioles
Correct Answer: B
Rationale: Correct because histamine released during mast cell degranulation in Type I
hypersensitivity binds H1 receptors causing vascular permeability and
bronchoconstriction, and H2 receptors causing vasodilation and increased gastric acid
secretion.
Q5: A 28-year-old female presents with a malar rash across her cheeks and nasal
bridge, photosensitivity, oral ulcers, and bilateral wrist arthritis. Laboratory studies
reveal positive ANA, elevated anti-dsDNA antibodies, decreased C3 and C4 complement
levels, and urinalysis shows proteinuria with RBC casts. Which pathophysiologic
mechanism best explains the renal involvement in this patient?
A. IgE-mediated mast cell activation causing interstitial nephritis
B. IgG/IgM antibody-mediated destruction of glomerular basement membrane
,C. Antigen-antibody complex deposition in glomerular capillaries causing immune
complex-mediated inflammation [CORRECT]
D. Cytotoxic T-cell direct lysis of renal tubular epithelial cells
Correct Answer: C
Rationale: Correct because lupus nephritis results from Type III hypersensitivity with
antigen-antibody complex deposition in glomerular capillaries, activating complement
and producing immune complex-mediated inflammation, which matches the clinical
presentation of SLE with positive anti-dsDNA and decreased C3/C4.
Q6: A patient with Graves' disease develops hyperthyroidism due to
autoantibody-mediated stimulation of the TSH receptor. This pathophysiologic
mechanism represents:
A. Type I IgE-mediated hypersensitivity
B. Type II cytotoxic antibody-mediated cell stimulation [CORRECT]
C. Type III immune complex deposition
D. Type IV delayed T-cell mediated hypersensitivity
Correct Answer: B
Rationale: Correct because Graves' disease represents Type II hypersensitivity involving
IgG autoantibody-mediated stimulation of the TSH receptor, which is a form of
antibody-mediated cytotoxic or stimulatory reaction targeting specific cellular antigens.
Q7: A patient receives a unit of ABO-incompatible blood and develops fever, chills, and
hemoglobinuria within 2 hours. The underlying pathophysiologic mechanism involves
pre-formed IgM and IgG antibodies binding to foreign RBC antigens and activating
complement. This represents:
A. Type I anaphylactic reaction
B. Type II cytotoxic hypersensitivity reaction [CORRECT]
C. Type III immune complex reaction
D. Type IV delayed hypersensitivity reaction
Correct Answer: B
Rationale: Correct because acute hemolytic transfusion reactions represent Type II
hypersensitivity involving pre-formed IgM and IgG antibodies binding to foreign RBC
surface antigens, activating complement and causing intravascular hemolysis.
, Q8: In autoimmune hemolytic anemia, the direct Coombs test is positive. The
pathophysiologic mechanism involves:
A. IgE-mediated mast cell activation and histamine release
B. IgG or IgM antibody-mediated RBC destruction with complement activation
[CORRECT]
C. T-cell mediated direct cellular lysis of erythrocytes
D. Circulating immune complex deposition on erythrocyte membranes
Correct Answer: B
Rationale: Correct because autoimmune hemolytic anemia represents Type II
hypersensitivity with IgG or IgM antibodies binding to RBC surface antigens, leading to
complement activation and extravascular hemolysis, producing a positive direct
Coombs test.
Q9: A patient develops glomerulonephritis three weeks after group A streptococcal
pharyngitis. Renal biopsy reveals subepithelial immune complex deposits. This
pathophysiologic process represents:
A. Type I hypersensitivity with IgE-mediated renal injury
B. Type II cytotoxic antibody-mediated glomerular destruction
C. Type III immune complex-mediated glomerulonephritis [CORRECT]
D. Type IV delayed hypersensitivity with granuloma formation
Correct Answer: C
Rationale: Correct because post-streptococcal glomerulonephritis represents Type III
hypersensitivity with circulating antigen-antibody complexes depositing in glomerular
capillaries, activating complement and producing immune complex-mediated
inflammation.
Q10: A patient with poison ivy contact dermatitis develops erythema, vesicles, and
pruritus 48 hours after exposure. The pathophysiologic mechanism involves sensitized
CD4+ T lymphocytes recognizing processed antigen presented by Langerhans cells.
This represents:
A. Type I immediate hypersensitivity
B. Type II cytotoxic reaction
C. Type III immune complex deposition
D. Type IV delayed T-cell mediated hypersensitivity [CORRECT]
Correct Answer: D
