McCance & Huether’s
Pathophysiology The
Biological Basis for Disease in
Adults and Children, 9th
Edition Complete Testbank
with Questions, Answers and
rationales
Table of contents
1.Module 1: Cellular Biology, Adaptation, and Genetic Alterations (Questions 1–25)
2Module 2: Inflammation, Immunity, and Hypersensitivity (Questions 26–50)
3Module 3: Neurological and Endocrine Alterations (Questions 51–100)
4 Module 4: Cardiovascular, Pulmonary, and Renal Pathophysiology (Questions 101–200)
Module 1: Cellular Biology, Adaptation, and
Genetic Alterations (Questions 1–25)
1. Question: What is the fundamental cellular adaptation seen in the left ventricle of a
patient experiencing chronic systemic hypertension?
Answer: Hypertrophy.
Rationale: Increased myocardial workload forces individual cardiac muscle cells to
increase in size rather than number (hyperplasia), as adult cardiac myocytes have limited
mitotic capability.
2. Question: Which form of irreversible cell death is characterized by nuclear dissolution
(karyolysis), pyknosis, and karyorrhexis accompanied by an acute inflammatory
reaction?
Answer: Necrosis.
Rationale: Unlike apoptosis, necrosis involves unregulated enzymatic digestion of cell
components, disruption of the plasma membrane, and leakage of cellular contents,
triggering surrounding inflammation.
,3. Question: What is the primary biochemical consequence of cellular hypoxia on ATP
synthesis?
Answer: Depletion of ATP.
Rationale: Oxygen is the final electron acceptor in the electron transport chain; hypoxia
halts oxidative phosphorylation, forcing the cell into anaerobic glycolysis and rapidly
depleting cellular energy reserves.
4. Question: Failure of which cellular pump leads directly to acute hydropic swelling
(cellular swelling) during hypoxic injury?+¿¿
Answer: The Sodium-Potassium (Na + ¿/K ¿) ATPase pump.
+¿¿
Rationale: Without ATP, the Na + ¿/K ¿pump fails. Sodium accumulates intracellularly,
drawing water osmotically into the cell and causing cytoplasmic swelling and
vacuolation.
5. Question: What type of necrosis is classically associated with ischemic injury to the
brain and central nervous system?
Answer: Liquefactive necrosis.
Rationale: Neural cells are rich in hydrolytic enzymes and lipids; when they die,
digesting enzymes transform the tissue into a liquid, viscous mass.
6. Question: Coagulative necrosis is primarily caused by protein denaturation and is most
commonly observed in which organs?
Answer: Heart, kidneys, and spleen.
Rationale: Ischemia in these solid organs denatures structural proteins and enzymes,
turning the tissue into a firm, opaque gel-like state.
7. Question: What is the term for the accumulation of excessive fluid within the
intercellular spaces and body cavities?
Answer: Edema.
Rationale: Edema results from shifts in fluid from the vascular space into interstitial
tissues, driven by changes in hydrostatic pressure, oncotic pressure, lymph obstruction, or
membrane permeability.
8. Question: What chromosomal abnormality causes Down syndrome?
Answer: Trisomy 21.
Rationale: Down syndrome is typically caused by the failure of chromosomes to separate
properly during meiosis (nondisjunction), resulting in three copies of chromosome 21.
9. Question: Which genetic disorder is characterized by an autosomal dominant inheritance
pattern causing progressive central nervous system degeneration and choreiform
movements?
Answer: Huntington disease.
Rationale: Huntington disease involves a CAG trinucleotide repeat expansion on
chromosome 4, leading to toxic mutant huntingtin protein accumulation and basal ganglia
destruction.
10. Question: What pattern of inheritance describes cystic fibrosis?
Answer: Autosomal recessive.
Rationale: Both parents must be carriers of the mutated CFTR gene on chromosome 7 for
an offspring to inherit and manifest the disease.
11. Question: What term describes an abnormal number of chromosomes that is not an exact
multiple of the haploid set (e.g., monosomy or trisomy)?
Answer: Aneuploidy.
, Rationale: Aneuploidy usually arises from meiotic nondisjunction, where homologous
chromosomes or sister chromatids fail to separate.
12. Question: What is the primary role of tumor suppressor genes (e.g., TP 53) in normal cell
biology?
Answer: To inhibit cell proliferation and regulate DNA repair or apoptosis.
Rationale: Tumor suppressor genes act as cellular "brakes," preventing unchecked cell
division until DNA damage is repaired or triggering cell death if damage is irreparable.
13. Question: What epigenetic mechanism involves the addition of methyl groups to
cytosine bases in DNA, typically resulting in transcriptional silencing?
Answer: DNA methylation.
Rationale: Hypermethylation of gene promoter regions compacts chromatin and prevents
transcription factors from binding, effectively turning genes "off."
14. Question: What is the biochemical definition of apoptosis?
Answer: Programmed cell death.
Rationale: Apoptosis is an active, highly regulated, energy-dependent cellular suicide
program that eliminates unwanted or damaged cells without causing inflammation.
15. Question: Which cellular organelle is responsible for generating the majority of cellular
ATP via oxidative phosphorylation?
Answer: Mitochondria.
Rationale: Mitochondria house the enzymes of the Krebs cycle and electron transport
chain, serving as the cell's primary power plants.
16. Question: What term describes the reversible replacement of one mature cell type by
another, less mature or differently specialized cell type (e.g., in the respiratory tract of
smokers)?
Answer: Metaplasia.
Rationale: Metaplasia is an adaptive substitution of cells better able to tolerate chronic
irritation or environmental stress (e.g., pseudostratified ciliated columnar epithelium
changing to stratified squamous epithelium).
17. Question: What is the clinical term for a localized area of ischemic necrosis caused by
the occlusion of arterial blood supply?
Answer: Infarct.
Rationale: Infarction results from sudden, prolonged ischemia, leading to coagulative (or
liquefactive) tissue death within the vascular territory.
18. Question: Which free radical is a potent reactive oxygen species (ROS) neutralized by
the enzyme superoxide dismutase (SOD)?
Answer: Superoxide radical (O•−¿ 2
¿
).
Rationale: SOD converts superoxide radicals into hydrogen peroxide, which is
subsequently broken down by catalase and glutathione peroxidase.
19. Question: What term describes the abnormal deposition of calcium salts in otherwise
normal tissues due to systemic hypercalcemia?
Answer: Metastatic calcification.
Rationale: Metastatic calcification can occur widely throughout the body in conditions
like hyperparathyroidism or vitamin D toxicity, contrasting with dystrophic calcification
seen in dying tissues.
20. Question: What is the primary morphological feature distinguishing cellular atrophy?
Answer: Decrease in cell size.
Pathophysiology The
Biological Basis for Disease in
Adults and Children, 9th
Edition Complete Testbank
with Questions, Answers and
rationales
Table of contents
1.Module 1: Cellular Biology, Adaptation, and Genetic Alterations (Questions 1–25)
2Module 2: Inflammation, Immunity, and Hypersensitivity (Questions 26–50)
3Module 3: Neurological and Endocrine Alterations (Questions 51–100)
4 Module 4: Cardiovascular, Pulmonary, and Renal Pathophysiology (Questions 101–200)
Module 1: Cellular Biology, Adaptation, and
Genetic Alterations (Questions 1–25)
1. Question: What is the fundamental cellular adaptation seen in the left ventricle of a
patient experiencing chronic systemic hypertension?
Answer: Hypertrophy.
Rationale: Increased myocardial workload forces individual cardiac muscle cells to
increase in size rather than number (hyperplasia), as adult cardiac myocytes have limited
mitotic capability.
2. Question: Which form of irreversible cell death is characterized by nuclear dissolution
(karyolysis), pyknosis, and karyorrhexis accompanied by an acute inflammatory
reaction?
Answer: Necrosis.
Rationale: Unlike apoptosis, necrosis involves unregulated enzymatic digestion of cell
components, disruption of the plasma membrane, and leakage of cellular contents,
triggering surrounding inflammation.
,3. Question: What is the primary biochemical consequence of cellular hypoxia on ATP
synthesis?
Answer: Depletion of ATP.
Rationale: Oxygen is the final electron acceptor in the electron transport chain; hypoxia
halts oxidative phosphorylation, forcing the cell into anaerobic glycolysis and rapidly
depleting cellular energy reserves.
4. Question: Failure of which cellular pump leads directly to acute hydropic swelling
(cellular swelling) during hypoxic injury?+¿¿
Answer: The Sodium-Potassium (Na + ¿/K ¿) ATPase pump.
+¿¿
Rationale: Without ATP, the Na + ¿/K ¿pump fails. Sodium accumulates intracellularly,
drawing water osmotically into the cell and causing cytoplasmic swelling and
vacuolation.
5. Question: What type of necrosis is classically associated with ischemic injury to the
brain and central nervous system?
Answer: Liquefactive necrosis.
Rationale: Neural cells are rich in hydrolytic enzymes and lipids; when they die,
digesting enzymes transform the tissue into a liquid, viscous mass.
6. Question: Coagulative necrosis is primarily caused by protein denaturation and is most
commonly observed in which organs?
Answer: Heart, kidneys, and spleen.
Rationale: Ischemia in these solid organs denatures structural proteins and enzymes,
turning the tissue into a firm, opaque gel-like state.
7. Question: What is the term for the accumulation of excessive fluid within the
intercellular spaces and body cavities?
Answer: Edema.
Rationale: Edema results from shifts in fluid from the vascular space into interstitial
tissues, driven by changes in hydrostatic pressure, oncotic pressure, lymph obstruction, or
membrane permeability.
8. Question: What chromosomal abnormality causes Down syndrome?
Answer: Trisomy 21.
Rationale: Down syndrome is typically caused by the failure of chromosomes to separate
properly during meiosis (nondisjunction), resulting in three copies of chromosome 21.
9. Question: Which genetic disorder is characterized by an autosomal dominant inheritance
pattern causing progressive central nervous system degeneration and choreiform
movements?
Answer: Huntington disease.
Rationale: Huntington disease involves a CAG trinucleotide repeat expansion on
chromosome 4, leading to toxic mutant huntingtin protein accumulation and basal ganglia
destruction.
10. Question: What pattern of inheritance describes cystic fibrosis?
Answer: Autosomal recessive.
Rationale: Both parents must be carriers of the mutated CFTR gene on chromosome 7 for
an offspring to inherit and manifest the disease.
11. Question: What term describes an abnormal number of chromosomes that is not an exact
multiple of the haploid set (e.g., monosomy or trisomy)?
Answer: Aneuploidy.
, Rationale: Aneuploidy usually arises from meiotic nondisjunction, where homologous
chromosomes or sister chromatids fail to separate.
12. Question: What is the primary role of tumor suppressor genes (e.g., TP 53) in normal cell
biology?
Answer: To inhibit cell proliferation and regulate DNA repair or apoptosis.
Rationale: Tumor suppressor genes act as cellular "brakes," preventing unchecked cell
division until DNA damage is repaired or triggering cell death if damage is irreparable.
13. Question: What epigenetic mechanism involves the addition of methyl groups to
cytosine bases in DNA, typically resulting in transcriptional silencing?
Answer: DNA methylation.
Rationale: Hypermethylation of gene promoter regions compacts chromatin and prevents
transcription factors from binding, effectively turning genes "off."
14. Question: What is the biochemical definition of apoptosis?
Answer: Programmed cell death.
Rationale: Apoptosis is an active, highly regulated, energy-dependent cellular suicide
program that eliminates unwanted or damaged cells without causing inflammation.
15. Question: Which cellular organelle is responsible for generating the majority of cellular
ATP via oxidative phosphorylation?
Answer: Mitochondria.
Rationale: Mitochondria house the enzymes of the Krebs cycle and electron transport
chain, serving as the cell's primary power plants.
16. Question: What term describes the reversible replacement of one mature cell type by
another, less mature or differently specialized cell type (e.g., in the respiratory tract of
smokers)?
Answer: Metaplasia.
Rationale: Metaplasia is an adaptive substitution of cells better able to tolerate chronic
irritation or environmental stress (e.g., pseudostratified ciliated columnar epithelium
changing to stratified squamous epithelium).
17. Question: What is the clinical term for a localized area of ischemic necrosis caused by
the occlusion of arterial blood supply?
Answer: Infarct.
Rationale: Infarction results from sudden, prolonged ischemia, leading to coagulative (or
liquefactive) tissue death within the vascular territory.
18. Question: Which free radical is a potent reactive oxygen species (ROS) neutralized by
the enzyme superoxide dismutase (SOD)?
Answer: Superoxide radical (O•−¿ 2
¿
).
Rationale: SOD converts superoxide radicals into hydrogen peroxide, which is
subsequently broken down by catalase and glutathione peroxidase.
19. Question: What term describes the abnormal deposition of calcium salts in otherwise
normal tissues due to systemic hypercalcemia?
Answer: Metastatic calcification.
Rationale: Metastatic calcification can occur widely throughout the body in conditions
like hyperparathyroidism or vitamin D toxicity, contrasting with dystrophic calcification
seen in dying tissues.
20. Question: What is the primary morphological feature distinguishing cellular atrophy?
Answer: Decrease in cell size.
