PORTAGE LEARNING NURS 231 MODULE 1-10
EXAMS 2026/2027 | Pathophysiology Latest Update |
Verified Answers | Pass Guaranteed - A+ Graded
MODULE 1: CELLULAR BIOLOGY & TISSUE ADAPTATION (40
Questions)
Q1: A 68-year-old male with chronic hypertension presents for follow-up. His
echocardiogram reveals left ventricular wall thickening without chamber dilation. The
nurse recognizes this cellular adaptation as which of the following?
A. Hyperplasia
B. Hypertrophy [CORRECT]
C. Metaplasia
D. Dysplasia
Correct Answer: B
Rationale: Hypertrophy is an increase in cell size resulting in enlarged tissue mass,
commonly seen in cardiac muscle in response to chronic pressure overload from
hypertension. Hyperplasia involves increased cell number; metaplasia is the reversible
replacement of one differentiated cell type with another; dysplasia represents
disordered, pre-neoplastic cellular development. This is a classic example of
physiologic adaptation to increased workload. Portage Learning Verified | Module 1
Q2: A patient with chronic obstructive pulmonary disease (COPD) develops chronic
hypoxemia. Biopsy of the kidneys reveals an increase in erythropoietin-producing cells.
This cellular response represents:
A. Atrophy
B. Hypertrophy
C. Hyperplasia [CORRECT]
D. Metaplasia
Correct Answer: C
,Rationale: Hyperplasia is an increase in the number of cells in response to a stimulus;
chronic hypoxemia stimulates renal interstitial cells to proliferate and increase
erythropoietin production. Atrophy is a decrease in cell size; hypertrophy is increased
cell size; metaplasia involves transformation to a different cell type. This compensatory
mechanism increases red blood cell production. Portage Learning Verified | Module 1
Q3: A 55-year-old woman with a 40-pack-year smoking history has bronchial biopsy
showing ciliated columnar epithelium replaced by stratified squamous epithelium. This
change is best described as:
A. Dysplasia
B. Metaplasia [CORRECT]
C. Anaplasia
D. Hyperplasia
Correct Answer: B
Rationale: Metaplasia is the reversible replacement of one differentiated cell type by
another, often in response to chronic irritation; smoking-induced squamous metaplasia
in bronchi is a classic example. Dysplasia involves disordered growth and is
pre-neoplastic; anaplasia indicates loss of differentiation in malignant cells; hyperplasia
is increased cell number. This adaptation protects against irritants but increases cancer
risk. Portage Learning Verified | Module 1
Q4: A patient presents with cervical cytology showing disordered epithelial maturation,
nuclear hyperchromasia, and loss of polarity. These findings are characteristic of:
A. Metaplasia
B. Dysplasia [CORRECT]
C. Hypertrophy
D. Hyperplasia
Correct Answer: B
Rationale: Dysplasia is characterized by disordered, dysfunctional cellular development
with nuclear atypia and loss of normal tissue architecture, representing a pre-neoplastic
change. Metaplasia is a reversible change to another cell type without atypia;
hypertrophy and hyperplasia are adaptive responses without cellular atypia. Dysplasia
,may progress to carcinoma if the causative stimulus persists. Portage Learning Verified
| Module 1
Q5: A 72-year-old bedridden patient has significant muscle wasting in the lower
extremities. This reduction in cell size is termed:
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
D. Apoptosis
Correct Answer: C
Rationale: Atrophy is a decrease in cell size due to reduced workload, disuse, or
inadequate nutrition; disuse atrophy from immobility is common in bedridden patients.
Hypertrophy is increased cell size; hyperplasia is increased cell number; apoptosis is
programmed cell death. Reversible atrophy can be restored with increased activity.
Portage Learning Verified | Module 1
Q6: Which organelle is responsible for ATP production through oxidative
phosphorylation?
A. Rough endoplasmic reticulum
B. Golgi apparatus
C. Mitochondria [CORRECT]
D. Lysosomes
Correct Answer: C
Rationale: Mitochondria are the powerhouses of the cell, generating ATP through
oxidative phosphorylation via the electron transport chain. The rough ER synthesizes
proteins; the Golgi apparatus modifies and packages proteins; lysosomes contain
hydrolytic enzymes for intracellular digestion. Mitochondrial dysfunction leads to
cellular energy failure. Portage Learning Verified | Module 1
Q7: A patient with a genetic lysosomal storage disease accumulates undigested
substrates in cells. This pathology results from dysfunction of which organelle?
A. Peroxisomes
B. Lysosomes [CORRECT]
C. Mitochondria
D. Ribosomes
, Correct Answer: B
Rationale: Lysosomes contain hydrolytic enzymes that digest macromolecules;
dysfunction leads to substrate accumulation, as seen in Gaucher disease and
Tay-Sachs disease. Peroxisomes oxidize fatty acids and detoxify; mitochondria produce
ATP; ribosomes synthesize proteins. Lysosomal storage diseases demonstrate the
critical role of intracellular digestion. Portage Learning Verified | Module 1
Q8: Which cellular structure is primarily responsible for synthesizing proteins destined
for secretion?
A. Smooth endoplasmic reticulum
B. Rough endoplasmic reticulum [CORRECT]
C. Golgi apparatus
D. Peroxisomes
Correct Answer: B
Rationale: The rough endoplasmic reticulum, studded with ribosomes, synthesizes
proteins that are secreted, inserted into membranes, or delivered to organelles. The
smooth ER synthesizes lipids and detoxifies; the Golgi modifies and packages proteins
after synthesis; peroxisomes perform oxidative reactions. Ribosomes on the rough ER
translate mRNA into polypeptide chains. Portage Learning Verified | Module 1
Q9: The Na+/K+-ATPase pump maintains cellular electrochemical gradients by
transporting:
A. 2 Na+ out and 3 K+ in
B. 3 Na+ out and 2 K+ in [CORRECT]
C. 3 Na+ in and 2 K+ out
D. 2 Na+ in and 3 K+ out
Correct Answer: B
Rationale: The Na+/K+-ATPase pump actively transports 3 sodium ions out and 2
potassium ions in against their concentration gradients, consuming ATP and
maintaining the resting membrane potential. This electrogenic pump is essential for
nerve impulse transmission, muscle contraction, and secondary active transport.
Inhibition by digitalis increases intracellular calcium. Portage Learning Verified | Module
1
EXAMS 2026/2027 | Pathophysiology Latest Update |
Verified Answers | Pass Guaranteed - A+ Graded
MODULE 1: CELLULAR BIOLOGY & TISSUE ADAPTATION (40
Questions)
Q1: A 68-year-old male with chronic hypertension presents for follow-up. His
echocardiogram reveals left ventricular wall thickening without chamber dilation. The
nurse recognizes this cellular adaptation as which of the following?
A. Hyperplasia
B. Hypertrophy [CORRECT]
C. Metaplasia
D. Dysplasia
Correct Answer: B
Rationale: Hypertrophy is an increase in cell size resulting in enlarged tissue mass,
commonly seen in cardiac muscle in response to chronic pressure overload from
hypertension. Hyperplasia involves increased cell number; metaplasia is the reversible
replacement of one differentiated cell type with another; dysplasia represents
disordered, pre-neoplastic cellular development. This is a classic example of
physiologic adaptation to increased workload. Portage Learning Verified | Module 1
Q2: A patient with chronic obstructive pulmonary disease (COPD) develops chronic
hypoxemia. Biopsy of the kidneys reveals an increase in erythropoietin-producing cells.
This cellular response represents:
A. Atrophy
B. Hypertrophy
C. Hyperplasia [CORRECT]
D. Metaplasia
Correct Answer: C
,Rationale: Hyperplasia is an increase in the number of cells in response to a stimulus;
chronic hypoxemia stimulates renal interstitial cells to proliferate and increase
erythropoietin production. Atrophy is a decrease in cell size; hypertrophy is increased
cell size; metaplasia involves transformation to a different cell type. This compensatory
mechanism increases red blood cell production. Portage Learning Verified | Module 1
Q3: A 55-year-old woman with a 40-pack-year smoking history has bronchial biopsy
showing ciliated columnar epithelium replaced by stratified squamous epithelium. This
change is best described as:
A. Dysplasia
B. Metaplasia [CORRECT]
C. Anaplasia
D. Hyperplasia
Correct Answer: B
Rationale: Metaplasia is the reversible replacement of one differentiated cell type by
another, often in response to chronic irritation; smoking-induced squamous metaplasia
in bronchi is a classic example. Dysplasia involves disordered growth and is
pre-neoplastic; anaplasia indicates loss of differentiation in malignant cells; hyperplasia
is increased cell number. This adaptation protects against irritants but increases cancer
risk. Portage Learning Verified | Module 1
Q4: A patient presents with cervical cytology showing disordered epithelial maturation,
nuclear hyperchromasia, and loss of polarity. These findings are characteristic of:
A. Metaplasia
B. Dysplasia [CORRECT]
C. Hypertrophy
D. Hyperplasia
Correct Answer: B
Rationale: Dysplasia is characterized by disordered, dysfunctional cellular development
with nuclear atypia and loss of normal tissue architecture, representing a pre-neoplastic
change. Metaplasia is a reversible change to another cell type without atypia;
hypertrophy and hyperplasia are adaptive responses without cellular atypia. Dysplasia
,may progress to carcinoma if the causative stimulus persists. Portage Learning Verified
| Module 1
Q5: A 72-year-old bedridden patient has significant muscle wasting in the lower
extremities. This reduction in cell size is termed:
A. Hypertrophy
B. Hyperplasia
C. Atrophy [CORRECT]
D. Apoptosis
Correct Answer: C
Rationale: Atrophy is a decrease in cell size due to reduced workload, disuse, or
inadequate nutrition; disuse atrophy from immobility is common in bedridden patients.
Hypertrophy is increased cell size; hyperplasia is increased cell number; apoptosis is
programmed cell death. Reversible atrophy can be restored with increased activity.
Portage Learning Verified | Module 1
Q6: Which organelle is responsible for ATP production through oxidative
phosphorylation?
A. Rough endoplasmic reticulum
B. Golgi apparatus
C. Mitochondria [CORRECT]
D. Lysosomes
Correct Answer: C
Rationale: Mitochondria are the powerhouses of the cell, generating ATP through
oxidative phosphorylation via the electron transport chain. The rough ER synthesizes
proteins; the Golgi apparatus modifies and packages proteins; lysosomes contain
hydrolytic enzymes for intracellular digestion. Mitochondrial dysfunction leads to
cellular energy failure. Portage Learning Verified | Module 1
Q7: A patient with a genetic lysosomal storage disease accumulates undigested
substrates in cells. This pathology results from dysfunction of which organelle?
A. Peroxisomes
B. Lysosomes [CORRECT]
C. Mitochondria
D. Ribosomes
, Correct Answer: B
Rationale: Lysosomes contain hydrolytic enzymes that digest macromolecules;
dysfunction leads to substrate accumulation, as seen in Gaucher disease and
Tay-Sachs disease. Peroxisomes oxidize fatty acids and detoxify; mitochondria produce
ATP; ribosomes synthesize proteins. Lysosomal storage diseases demonstrate the
critical role of intracellular digestion. Portage Learning Verified | Module 1
Q8: Which cellular structure is primarily responsible for synthesizing proteins destined
for secretion?
A. Smooth endoplasmic reticulum
B. Rough endoplasmic reticulum [CORRECT]
C. Golgi apparatus
D. Peroxisomes
Correct Answer: B
Rationale: The rough endoplasmic reticulum, studded with ribosomes, synthesizes
proteins that are secreted, inserted into membranes, or delivered to organelles. The
smooth ER synthesizes lipids and detoxifies; the Golgi modifies and packages proteins
after synthesis; peroxisomes perform oxidative reactions. Ribosomes on the rough ER
translate mRNA into polypeptide chains. Portage Learning Verified | Module 1
Q9: The Na+/K+-ATPase pump maintains cellular electrochemical gradients by
transporting:
A. 2 Na+ out and 3 K+ in
B. 3 Na+ out and 2 K+ in [CORRECT]
C. 3 Na+ in and 2 K+ out
D. 2 Na+ in and 3 K+ out
Correct Answer: B
Rationale: The Na+/K+-ATPase pump actively transports 3 sodium ions out and 2
potassium ions in against their concentration gradients, consuming ATP and
maintaining the resting membrane potential. This electrogenic pump is essential for
nerve impulse transmission, muscle contraction, and secondary active transport.
Inhibition by digitalis increases intracellular calcium. Portage Learning Verified | Module
1
