1. Which of the following is the primary cause of metabolic acidosis?
A) Excessive renal bicarbonate loss
B) Decreased ventilation
C) Accumulation of fixed acids
D) Excessive carbon dioxide retention
Answer: C) Accumulation of fixed acids
Rationale: Metabolic acidosis primarily results from the accumulation
of non-volatile acids (fixed acids), such as lactic acid or ketoacids, which
overwhelm the buffering capacity of the blood. Conditions like diabetic
ketoacidosis, renal failure, and lactic acidosis are common causes.
2. In the pathophysiology of emphysema, which of the following is the
primary issue?
A) Excessive mucus production leading to airway obstruction
B) Destruction of the alveolar walls leading to decreased surface area
for gas exchange
C) Inflammation of the pleura
D) Overproduction of surfactant
Answer: B) Destruction of the alveolar walls leading to decreased
surface area for gas exchange
Rationale: In emphysema, the destruction of the alveolar walls
decreases the surface area available for gas exchange, resulting in
impaired oxygenation. This damage is often due to chronic smoking or
alpha-1 antitrypsin deficiency, leading to airflow limitation.
3. Which of the following is characteristic of chronic kidney disease
(CKD)?
,A) Hypernatremia
B) Hypokalemia
C) Metabolic alkalosis
D) Decreased glomerular filtration rate (GFR)
Answer: D) Decreased glomerular filtration rate (GFR)
Rationale: Chronic kidney disease is characterized by a gradual decline
in kidney function, reflected by a decreased glomerular filtration rate
(GFR). As kidney function deteriorates, waste products accumulate in
the blood, leading to a variety of metabolic disturbances, including
acidosis, not alkalosis.
4. In acute pancreatitis, what is the primary cause of cellular injury in
pancreatic cells?
A) Auto-digestion of pancreatic tissue by digestive enzymes
B) Viral infection of the pancreas
C) Chronic alcohol consumption leading to fibrosis
D) Inflammatory mediators from the liver
Answer: A) Auto-digestion of pancreatic tissue by digestive enzymes
Rationale: In acute pancreatitis, the pancreatic enzymes, such as
trypsinogen, are prematurely activated within the pancreas and begin
digesting the pancreatic tissue itself. This process leads to inflammation,
necrosis, and edema.
5. Which of the following is the underlying pathophysiology of
osteoarthritis?
A) Autoimmune destruction of synovial tissue
B) Accumulation of uric acid crystals in joints
, C) Degeneration of articular cartilage and underlying bone
D) Chronic inflammation of the ligaments and tendons
Answer: C) Degeneration of articular cartilage and underlying bone
Rationale: Osteoarthritis is primarily caused by the progressive
degeneration of articular cartilage, leading to joint pain and stiffness.
This mechanical breakdown results in bone remodeling and sometimes
joint deformities.
6. Which of the following is a hallmark feature of the pathophysiology
of systemic lupus erythematosus (SLE)?
A) Destruction of thyroid tissue
B) Formation of autoantibodies against nuclear antigens
C) Progressive fibrosis of lung tissue
D) Overproduction of insulin by the pancreas
Answer: B) Formation of autoantibodies against nuclear antigens
Rationale: Systemic lupus erythematosus is an autoimmune disease
characterized by the formation of autoantibodies, including antinuclear
antibodies (ANA), which attack the body’s own tissues. This leads to
systemic inflammation and damage to various organs.
7. Which of the following best explains the pathophysiology of heart
failure with preserved ejection fraction (HFpEF)?
A) Impaired systolic function of the left ventricle
B) Diastolic dysfunction due to left ventricular stiffness
C) Decreased preload due to hypovolemia
D) Excessive preload due to sodium and water retention
A) Excessive renal bicarbonate loss
B) Decreased ventilation
C) Accumulation of fixed acids
D) Excessive carbon dioxide retention
Answer: C) Accumulation of fixed acids
Rationale: Metabolic acidosis primarily results from the accumulation
of non-volatile acids (fixed acids), such as lactic acid or ketoacids, which
overwhelm the buffering capacity of the blood. Conditions like diabetic
ketoacidosis, renal failure, and lactic acidosis are common causes.
2. In the pathophysiology of emphysema, which of the following is the
primary issue?
A) Excessive mucus production leading to airway obstruction
B) Destruction of the alveolar walls leading to decreased surface area
for gas exchange
C) Inflammation of the pleura
D) Overproduction of surfactant
Answer: B) Destruction of the alveolar walls leading to decreased
surface area for gas exchange
Rationale: In emphysema, the destruction of the alveolar walls
decreases the surface area available for gas exchange, resulting in
impaired oxygenation. This damage is often due to chronic smoking or
alpha-1 antitrypsin deficiency, leading to airflow limitation.
3. Which of the following is characteristic of chronic kidney disease
(CKD)?
,A) Hypernatremia
B) Hypokalemia
C) Metabolic alkalosis
D) Decreased glomerular filtration rate (GFR)
Answer: D) Decreased glomerular filtration rate (GFR)
Rationale: Chronic kidney disease is characterized by a gradual decline
in kidney function, reflected by a decreased glomerular filtration rate
(GFR). As kidney function deteriorates, waste products accumulate in
the blood, leading to a variety of metabolic disturbances, including
acidosis, not alkalosis.
4. In acute pancreatitis, what is the primary cause of cellular injury in
pancreatic cells?
A) Auto-digestion of pancreatic tissue by digestive enzymes
B) Viral infection of the pancreas
C) Chronic alcohol consumption leading to fibrosis
D) Inflammatory mediators from the liver
Answer: A) Auto-digestion of pancreatic tissue by digestive enzymes
Rationale: In acute pancreatitis, the pancreatic enzymes, such as
trypsinogen, are prematurely activated within the pancreas and begin
digesting the pancreatic tissue itself. This process leads to inflammation,
necrosis, and edema.
5. Which of the following is the underlying pathophysiology of
osteoarthritis?
A) Autoimmune destruction of synovial tissue
B) Accumulation of uric acid crystals in joints
, C) Degeneration of articular cartilage and underlying bone
D) Chronic inflammation of the ligaments and tendons
Answer: C) Degeneration of articular cartilage and underlying bone
Rationale: Osteoarthritis is primarily caused by the progressive
degeneration of articular cartilage, leading to joint pain and stiffness.
This mechanical breakdown results in bone remodeling and sometimes
joint deformities.
6. Which of the following is a hallmark feature of the pathophysiology
of systemic lupus erythematosus (SLE)?
A) Destruction of thyroid tissue
B) Formation of autoantibodies against nuclear antigens
C) Progressive fibrosis of lung tissue
D) Overproduction of insulin by the pancreas
Answer: B) Formation of autoantibodies against nuclear antigens
Rationale: Systemic lupus erythematosus is an autoimmune disease
characterized by the formation of autoantibodies, including antinuclear
antibodies (ANA), which attack the body’s own tissues. This leads to
systemic inflammation and damage to various organs.
7. Which of the following best explains the pathophysiology of heart
failure with preserved ejection fraction (HFpEF)?
A) Impaired systolic function of the left ventricle
B) Diastolic dysfunction due to left ventricular stiffness
C) Decreased preload due to hypovolemia
D) Excessive preload due to sodium and water retention
