NSG 5003 Midterm Exam Questions and
Answers
Course: NSG 5003 Advanced Pathophysiology
Exam Focus: Comprehensive Midterm Review (Cellular Biology, Immunity, Cardiovascular,
Renal, Respiratory, Endocrine, and Neurological Systems)
Section 1: Cellular Pathology, Genetics & Immunity
(Questions 1–10)
1. Which cellular adaptation involves the reversible replacement of one adult cell type
by another adult cell type better able to withstand environmental stress?
Correct Answer: Metaplasia
Explanation: Metaplasia is a reversible structural adaptation where one mature cell type is
replaced by another less differentiated or different mature cell type (e.g., columnar to squamous
epithelial metaplasia in the bronchi of cigarette smokers). Dysplasia involves disordered growth,
whereas hyperplasia is an increase in cell number.
2. What is the primary mechanism of cell injury resulting from ischemia-reperfusion
injury?
Correct Answer: Formation of Reactive Oxygen Species (ROS) and oxidative stress
Explanation: Reoxygenation of ischemic tissue generates excess reactive oxygen species
(ROS) such as superoxide radicals and hydrogen peroxide. These free radicals induce lipid
peroxidation, membrane damage, mitochondrial dysfunction, and cellular necrosis or apoptosis.
3. How does apoptosis differ fundamentally from necrosis at the cellular level?
Correct Answer: Apoptosis is programmed cell death without plasma membrane
disruption or inflammation; necrosis involves plasma membrane lysis and inflammatory
response.
Explanation: Apoptosis is an energy-dependent (ATP-requiring) programmed physiological or
, pathological cell suicide pathway characterized by cell shrinkage, chromatin condensation, and
apoptotic body formation cleared by phagocytes without causing surrounding tissue
inflammation.
4. Cystic Fibrosis is inherited in which genetic pattern?
Correct Answer: Autosomal Recessive
Explanation: Cystic Fibrosis requires two mutated copies of the CFTR gene (one from each
parent) to manifest clinically. Heterozygous carrier individuals remain asymptomatic.
5. What key cellular mediator triggers acute symptoms during a Type I
Hypersensitivity reaction?
Correct Answer: IgE-mediated mast cell degranulation and histamine release
Explanation: In Type I hypersensitivity, re-exposure to an allergen cross-links IgE antibodies
bound to high-affinity Fc receptors on mast cells and basophils, causing immediate degranulation
and release of preformed mediators like histamine, leukotrienes, and prostaglandins.
6. Which condition is a classic example of a Type II (Antibody-Mediated Cytotoxic)
Hypersensitivity reaction?
Correct Answer: Myasthenia Gravis (and ABO blood transfusion reactions)
Explanation: Type II hypersensitivity involves tissue-specific IgG or IgM antibodies binding to
cell-surface antigens, leading to complement activation, cell lysis, or receptor
blockade/stimulation (e.g., anti-AChR antibodies in Myasthenia Gravis).
7. What is the fundamental pathological mechanism of Type III Hypersensitivity
reactions?
Correct Answer: Deposition of circulating antigen-antibody immune complexes in
vascular walls and tissues
Explanation: Soluble immune complexes (antigen-IgG/IgM) form in circulation and deposit in
small vessel walls, glomeruli, or joints, activating complement and attracting neutrophils that
release lysosomal enzymes causing microvascular damage (e.g., SLE, Post-streptococcal
glomerulonephritis).
, 8. Type IV Hypersensitivity is uniquely characterized by which immunological
component?
Correct Answer: Cell-mediated T-lymphocyte response without antibody involvement
Explanation: Type IV (delayed-type) hypersensitivity is mediated by sensitized CD4+
(Th1/Th17) and CD8+ T cells that release inflammatory cytokines or directly lyse target cells 24–
72 hours after antigen exposure (e.g., Tuberculin skin test, poison ivy contact dermatitis).
9. Which proinflammatory cytokines serve as the primary endogenous pyrogens
during the acute phase response?
Correct Answer: Interleukin-1 (IL-1), Tumor Necrosis Factor-alpha (TNF-alpha), and
Interleukin-6 (IL-6)
Explanation: Macrophages release IL-1, TNF-alpha, and IL-6 during acute inflammation. These
cytokines act on the anterior hypothalamus to raise the thermoregulatory set point, induce acute-
phase protein production (CRP, fibrinogen) in the liver, and cause leukocytosis.
10. What immunologic laboratory hallmark is highly specific for systemic lupus
erythematosus (SLE)?
Correct Answer: Anti-double-stranded DNA (anti-dsDNA) and Anti-Smith (anti-Sm)
antibodies
Explanation: While Antinuclear Antibodies (ANA) are sensitive for SLE, anti-dsDNA and anti-Sm
antibodies are highly specific for SLE, with anti-dsDNA levels correlating directly with disease
activity and lupus nephritis.
Section 2: Cardiovascular System & Hemodynamics
(Questions 11–25)
11. What physiological variable serves as the principal determinant of cardiac
preload?
Correct Answer: End-Diastolic Volume (EDV)
Explanation: Preload is the degree of myocardial stretch at the end of diastole just prior to
contraction, directly dictated by venous return and the end-diastolic filling volume of the ventricle.
Answers
Course: NSG 5003 Advanced Pathophysiology
Exam Focus: Comprehensive Midterm Review (Cellular Biology, Immunity, Cardiovascular,
Renal, Respiratory, Endocrine, and Neurological Systems)
Section 1: Cellular Pathology, Genetics & Immunity
(Questions 1–10)
1. Which cellular adaptation involves the reversible replacement of one adult cell type
by another adult cell type better able to withstand environmental stress?
Correct Answer: Metaplasia
Explanation: Metaplasia is a reversible structural adaptation where one mature cell type is
replaced by another less differentiated or different mature cell type (e.g., columnar to squamous
epithelial metaplasia in the bronchi of cigarette smokers). Dysplasia involves disordered growth,
whereas hyperplasia is an increase in cell number.
2. What is the primary mechanism of cell injury resulting from ischemia-reperfusion
injury?
Correct Answer: Formation of Reactive Oxygen Species (ROS) and oxidative stress
Explanation: Reoxygenation of ischemic tissue generates excess reactive oxygen species
(ROS) such as superoxide radicals and hydrogen peroxide. These free radicals induce lipid
peroxidation, membrane damage, mitochondrial dysfunction, and cellular necrosis or apoptosis.
3. How does apoptosis differ fundamentally from necrosis at the cellular level?
Correct Answer: Apoptosis is programmed cell death without plasma membrane
disruption or inflammation; necrosis involves plasma membrane lysis and inflammatory
response.
Explanation: Apoptosis is an energy-dependent (ATP-requiring) programmed physiological or
, pathological cell suicide pathway characterized by cell shrinkage, chromatin condensation, and
apoptotic body formation cleared by phagocytes without causing surrounding tissue
inflammation.
4. Cystic Fibrosis is inherited in which genetic pattern?
Correct Answer: Autosomal Recessive
Explanation: Cystic Fibrosis requires two mutated copies of the CFTR gene (one from each
parent) to manifest clinically. Heterozygous carrier individuals remain asymptomatic.
5. What key cellular mediator triggers acute symptoms during a Type I
Hypersensitivity reaction?
Correct Answer: IgE-mediated mast cell degranulation and histamine release
Explanation: In Type I hypersensitivity, re-exposure to an allergen cross-links IgE antibodies
bound to high-affinity Fc receptors on mast cells and basophils, causing immediate degranulation
and release of preformed mediators like histamine, leukotrienes, and prostaglandins.
6. Which condition is a classic example of a Type II (Antibody-Mediated Cytotoxic)
Hypersensitivity reaction?
Correct Answer: Myasthenia Gravis (and ABO blood transfusion reactions)
Explanation: Type II hypersensitivity involves tissue-specific IgG or IgM antibodies binding to
cell-surface antigens, leading to complement activation, cell lysis, or receptor
blockade/stimulation (e.g., anti-AChR antibodies in Myasthenia Gravis).
7. What is the fundamental pathological mechanism of Type III Hypersensitivity
reactions?
Correct Answer: Deposition of circulating antigen-antibody immune complexes in
vascular walls and tissues
Explanation: Soluble immune complexes (antigen-IgG/IgM) form in circulation and deposit in
small vessel walls, glomeruli, or joints, activating complement and attracting neutrophils that
release lysosomal enzymes causing microvascular damage (e.g., SLE, Post-streptococcal
glomerulonephritis).
, 8. Type IV Hypersensitivity is uniquely characterized by which immunological
component?
Correct Answer: Cell-mediated T-lymphocyte response without antibody involvement
Explanation: Type IV (delayed-type) hypersensitivity is mediated by sensitized CD4+
(Th1/Th17) and CD8+ T cells that release inflammatory cytokines or directly lyse target cells 24–
72 hours after antigen exposure (e.g., Tuberculin skin test, poison ivy contact dermatitis).
9. Which proinflammatory cytokines serve as the primary endogenous pyrogens
during the acute phase response?
Correct Answer: Interleukin-1 (IL-1), Tumor Necrosis Factor-alpha (TNF-alpha), and
Interleukin-6 (IL-6)
Explanation: Macrophages release IL-1, TNF-alpha, and IL-6 during acute inflammation. These
cytokines act on the anterior hypothalamus to raise the thermoregulatory set point, induce acute-
phase protein production (CRP, fibrinogen) in the liver, and cause leukocytosis.
10. What immunologic laboratory hallmark is highly specific for systemic lupus
erythematosus (SLE)?
Correct Answer: Anti-double-stranded DNA (anti-dsDNA) and Anti-Smith (anti-Sm)
antibodies
Explanation: While Antinuclear Antibodies (ANA) are sensitive for SLE, anti-dsDNA and anti-Sm
antibodies are highly specific for SLE, with anti-dsDNA levels correlating directly with disease
activity and lupus nephritis.
Section 2: Cardiovascular System & Hemodynamics
(Questions 11–25)
11. What physiological variable serves as the principal determinant of cardiac
preload?
Correct Answer: End-Diastolic Volume (EDV)
Explanation: Preload is the degree of myocardial stretch at the end of diastole just prior to
contraction, directly dictated by venous return and the end-diastolic filling volume of the ventricle.
