NSG5140 Week 5 Midterm Exam | Advanced
Pathophysiology NSG5140 Expert-Verified
Questions with Detailed Rationales 2026
Edition | Complete Actual Exam Q&A | 100%
Pass Guaranteed | Graded A+
Question 1:
A patient with chronic hypertension develops left ventricular wall thickening.
Which mechanism BEST explains this adaptation?
A) Hyperplasia of cardiac muscle cells
B) Hypertrophy of cardiac muscle cells
C) Metaplasia of cardiac tissue
D) Dysplasia of the myocardium
Rationale: Hypertension increases the workload on the left ventricle, leading
to hypertrophy—an increase in cell size without an increase in cell number.
Cardiac muscle cells are terminally differentiated and cannot undergo
hyperplasia (increase in cell number). Metaplasia is the replacement of one
differentiated cell type with another, and dysplasia refers to abnormal cellular
growth, both of which are not adaptive responses in the heart.
Question 2:
Which cellular organelle is primarily responsible for ATP production through
oxidative phosphorylation?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Rationale: Mitochondria are the primary site of ATP production through
oxidative phosphorylation. They contain the electron transport chain and ATP
synthase, which generate ATP from ADP and inorganic phosphate. Ribosomes
,are responsible for protein synthesis, the Golgi apparatus modifies and
packages proteins, and the endoplasmic reticulum is involved in protein
synthesis and lipid metabolism.
Question 3:
A patient with chronic hepatitis B develops cirrhosis. Which of the following
cellular adaptations is MOST likely occurring in the liver?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Atrophy
Rationale: In chronic liver disease, hepatocytes may undergo metaplasia,
where one differentiated cell type is replaced by another. In cirrhosis,
hepatocytes are replaced by fibrous tissue and regenerative nodules. While
hyperplasia (increased cell number) may occur in the early stages, the
progressive fibrosis and architectural distortion characteristic of cirrhosis
represent a form of pathologic metaplasia and fibrosis.
Question 4:
A 65-year-old patient with a 40-pack-year smoking history develops a
persistent cough and hemoptysis. A biopsy reveals squamous cell carcinoma
of the lung. Which cellular change in the bronchial epithelium MOST likely
preceded this malignancy?
A) Hypertrophy
B) Squamous metaplasia
C) Hyperplasia
D) Atrophy
Rationale: Chronic irritation from cigarette smoke causes squamous
metaplasia of the normal pseudostratified ciliated columnar epithelium of the
bronchi. This metaplastic change is a protective adaptation but increases the
risk of malignant transformation. Squamous metaplasia is considered a
precursor lesion that can progress to dysplasia and eventually squamous cell
carcinoma.
,Question 5:
What is the primary function of the sodium-potassium pump in cells?
A) To facilitate glucose transport into the cell
B) To maintain the resting membrane potential by transporting 3 Na⁺
out and 2 K⁺ into the cell
C) To transport calcium out of the cell
D) To regulate intracellular pH
Rationale: The sodium-potassium pump (Na⁺/K⁺-ATPase) maintains the
resting membrane potential by actively transporting 3 sodium ions out of the
cell and 2 potassium ions into the cell against their concentration gradients,
using ATP as an energy source. This creates an electrochemical gradient
essential for nerve impulse transmission, muscle contraction, and secondary
active transport.
Question 6:
A patient with chronic hypertension has an enlarged heart. This increase in
muscle mass is primarily due to which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
Rationale: Chronic hypertension increases afterload on the left ventricle,
causing cardiac myocytes to increase in size (hypertrophy) to generate
greater contractile force. Cardiac muscle cells do not divide significantly after
birth, so hyperplasia is not a major mechanism. This hypertrophic response is
initially compensatory but can eventually become maladaptive, leading to
heart failure.
Question 7:
Which of the following BEST describes the difference between benign and
malignant neoplasms?
, A) Benign neoplasms grow faster than malignant neoplasms
B) Malignant neoplasms have the ability to invade and metastasize
C) Benign neoplasms are always encapsulated
D) Malignant neoplasms are always larger than benign neoplasms
Rationale: The key distinguishing feature of malignant neoplasms (cancers)
is their ability to invade surrounding tissues and metastasize to distant sites.
Benign neoplasms are generally well-circumscribed, non-invasive, and do not
metastasize. While benign tumors may grow slowly, not all are encapsulated,
and size is not a distinguishing factor.
Question 8:
A patient presents with a tumor that is well-circumscribed, non-invasive, and
composed of cells that resemble the tissue of origin. This tumor is MOST
likely:
A) Malignant
B) Benign
C) Anaplastic
D) Metastatic
Rationale: Benign tumors are characterized by well-circumscribed borders,
lack of invasion into surrounding tissues, and cellular differentiation that
resembles the tissue of origin. Malignant tumors are invasive, poorly
differentiated (anaplastic), and have the potential to metastasize. The
described characteristics are classic features of a benign neoplasm.
Question 9:
Which of the following is a characteristic of malignant cells?
A) Well-differentiated morphology
B) Anaplasia and loss of cellular differentiation
C) Encapsulation
D) Slow growth rate
Rationale: Malignant cells exhibit anaplasia, which is the loss of cellular
differentiation and organization. They appear primitive and undifferentiated,
Pathophysiology NSG5140 Expert-Verified
Questions with Detailed Rationales 2026
Edition | Complete Actual Exam Q&A | 100%
Pass Guaranteed | Graded A+
Question 1:
A patient with chronic hypertension develops left ventricular wall thickening.
Which mechanism BEST explains this adaptation?
A) Hyperplasia of cardiac muscle cells
B) Hypertrophy of cardiac muscle cells
C) Metaplasia of cardiac tissue
D) Dysplasia of the myocardium
Rationale: Hypertension increases the workload on the left ventricle, leading
to hypertrophy—an increase in cell size without an increase in cell number.
Cardiac muscle cells are terminally differentiated and cannot undergo
hyperplasia (increase in cell number). Metaplasia is the replacement of one
differentiated cell type with another, and dysplasia refers to abnormal cellular
growth, both of which are not adaptive responses in the heart.
Question 2:
Which cellular organelle is primarily responsible for ATP production through
oxidative phosphorylation?
A) Ribosome
B) Golgi apparatus
C) Mitochondria
D) Endoplasmic reticulum
Rationale: Mitochondria are the primary site of ATP production through
oxidative phosphorylation. They contain the electron transport chain and ATP
synthase, which generate ATP from ADP and inorganic phosphate. Ribosomes
,are responsible for protein synthesis, the Golgi apparatus modifies and
packages proteins, and the endoplasmic reticulum is involved in protein
synthesis and lipid metabolism.
Question 3:
A patient with chronic hepatitis B develops cirrhosis. Which of the following
cellular adaptations is MOST likely occurring in the liver?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Atrophy
Rationale: In chronic liver disease, hepatocytes may undergo metaplasia,
where one differentiated cell type is replaced by another. In cirrhosis,
hepatocytes are replaced by fibrous tissue and regenerative nodules. While
hyperplasia (increased cell number) may occur in the early stages, the
progressive fibrosis and architectural distortion characteristic of cirrhosis
represent a form of pathologic metaplasia and fibrosis.
Question 4:
A 65-year-old patient with a 40-pack-year smoking history develops a
persistent cough and hemoptysis. A biopsy reveals squamous cell carcinoma
of the lung. Which cellular change in the bronchial epithelium MOST likely
preceded this malignancy?
A) Hypertrophy
B) Squamous metaplasia
C) Hyperplasia
D) Atrophy
Rationale: Chronic irritation from cigarette smoke causes squamous
metaplasia of the normal pseudostratified ciliated columnar epithelium of the
bronchi. This metaplastic change is a protective adaptation but increases the
risk of malignant transformation. Squamous metaplasia is considered a
precursor lesion that can progress to dysplasia and eventually squamous cell
carcinoma.
,Question 5:
What is the primary function of the sodium-potassium pump in cells?
A) To facilitate glucose transport into the cell
B) To maintain the resting membrane potential by transporting 3 Na⁺
out and 2 K⁺ into the cell
C) To transport calcium out of the cell
D) To regulate intracellular pH
Rationale: The sodium-potassium pump (Na⁺/K⁺-ATPase) maintains the
resting membrane potential by actively transporting 3 sodium ions out of the
cell and 2 potassium ions into the cell against their concentration gradients,
using ATP as an energy source. This creates an electrochemical gradient
essential for nerve impulse transmission, muscle contraction, and secondary
active transport.
Question 6:
A patient with chronic hypertension has an enlarged heart. This increase in
muscle mass is primarily due to which cellular adaptation?
A) Hypertrophy
B) Hyperplasia
C) Metaplasia
D) Dysplasia
Rationale: Chronic hypertension increases afterload on the left ventricle,
causing cardiac myocytes to increase in size (hypertrophy) to generate
greater contractile force. Cardiac muscle cells do not divide significantly after
birth, so hyperplasia is not a major mechanism. This hypertrophic response is
initially compensatory but can eventually become maladaptive, leading to
heart failure.
Question 7:
Which of the following BEST describes the difference between benign and
malignant neoplasms?
, A) Benign neoplasms grow faster than malignant neoplasms
B) Malignant neoplasms have the ability to invade and metastasize
C) Benign neoplasms are always encapsulated
D) Malignant neoplasms are always larger than benign neoplasms
Rationale: The key distinguishing feature of malignant neoplasms (cancers)
is their ability to invade surrounding tissues and metastasize to distant sites.
Benign neoplasms are generally well-circumscribed, non-invasive, and do not
metastasize. While benign tumors may grow slowly, not all are encapsulated,
and size is not a distinguishing factor.
Question 8:
A patient presents with a tumor that is well-circumscribed, non-invasive, and
composed of cells that resemble the tissue of origin. This tumor is MOST
likely:
A) Malignant
B) Benign
C) Anaplastic
D) Metastatic
Rationale: Benign tumors are characterized by well-circumscribed borders,
lack of invasion into surrounding tissues, and cellular differentiation that
resembles the tissue of origin. Malignant tumors are invasive, poorly
differentiated (anaplastic), and have the potential to metastasize. The
described characteristics are classic features of a benign neoplasm.
Question 9:
Which of the following is a characteristic of malignant cells?
A) Well-differentiated morphology
B) Anaplasia and loss of cellular differentiation
C) Encapsulation
D) Slow growth rate
Rationale: Malignant cells exhibit anaplasia, which is the loss of cellular
differentiation and organization. They appear primitive and undifferentiated,
