BIOL 331 | BIOL331 Final Exam: Pathophysiology
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A 65-year-old male with a history of long-standing hypertension shows increased thickness
of the left ventricular wall on echocardiography. What cellular adaptation is occurring?
A. Atrophy
B. Metaplasia
C. Hyperplasia
D. Hypertrophy
Correct Answer: D
Explanation: The scenario describes a compensatory response of the heart to an increased
workload from systemic hypertension. Hypertrophy involves an increase in individual cell
size rather than cell number in tissues that cannot divide. Atrophy would involve a
decrease in cell size due to disuse or ischemia. Hyperplasia refers to an increase in the
number of cells which is not typical for cardiac muscle. This specific physiological change
aims to maintain cardiac output against higher peripheral resistance.
2. Which type of hypersensitivity reaction is characterized by the formation of immune
complexes that deposit in vessel walls?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct Answer: C
Explanation: Type III hypersensitivity involves the circulation of antigen-antibody
complexes that settle in tissues like blood vessels. These complexes trigger the complement
system and lead to localized inflammation and tissue damage. Type I is IgE-mediated and
involves immediate allergic responses like anaphylaxis. Type II involves antibodies binding
directly to antigens on specific cell surfaces. Type IV is a delayed-type cell-mediated
response involving T-lymphocytes rather than antibodies.
3. A patient presents with dyspnea, orthopnea, and crackles on lung auscultation. Which
condition is most likely causing these symptoms?
A. Left-sided heart failure
B. Right-sided heart failure
,C. Pulmonary Embolism
D. Chronic Bronchitis
Correct Answer: A
Explanation: Left-sided heart failure leads to pulmonary congestion because the left
ventricle cannot pump blood forward effectively. This causes fluid to back up into the lungs
resulting in pulmonary edema and crackles. Dyspnea and orthopnea are classic signs of
fluid accumulation in the alveolar spaces. Right-sided heart failure typically results in
systemic symptoms like peripheral edema and jugular venous distention. Pulmonary
embolism usually presents with sudden sharp chest pain and acute respiratory distress.
4. What is the primary pathophysiological mechanism behind emphysema?
A. Chronic inflammation of the bronchial tubes
B. Fluid accumulation in the pleural space
C. Hyper-responsiveness of the airways to allergens
D. Destruction of alveolar walls and loss of elastic recoil
Correct Answer: D
Explanation: Emphysema is characterized by the destruction of alveolar walls which
reduces the surface area for gas exchange. The loss of elastic recoil causes air trapping
within the lungs during expiration. Chronic bronchitis involves inflammation and mucus
production in the larger airways. Asthma is characterized by reversible airway hyper-
responsiveness and bronchospasm. Emphysema is often caused by alpha-1 antitrypsin
deficiency or chronic exposure to cigarette smoke.
5. Why do patients with chronic kidney disease (CKD) often develop anemia?
A. Chronic blood loss in the urine
B. Vitamin B12 deficiency due to poor absorption
C. Reduced production of erythropoietin by the kidneys
D. Increased destruction of red blood cells in the spleen
Correct Answer: C
Explanation: The kidneys are responsible for producing erythropoietin which stimulates
red blood cell production in the bone marrow. As renal function declines in CKD, the
production of this hormone decreases significantly. This leads to a normochromic
normocytic anemia despite adequate iron stores. While nutritional deficiencies can occur in
CKD, they are not the primary cause of anemia. Treatment often involves the
administration of synthetic erythropoiesis-stimulating agents.
, 6. In Type 1 Diabetes Mellitus, what is the underlying cause of absolute insulin deficiency?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive secretion of glucagon from alpha cells
D. Down-regulation of insulin receptors
Correct Answer: B
Explanation: Type 1 Diabetes is characterized by an autoimmune attack against the beta
cells in the Islets of Langerhans. This leads to a total lack of endogenous insulin production
by the pancreas. Insulin resistance is the hallmark of Type 2 Diabetes rather than Type 1.
Without insulin, glucose cannot enter cells leading to hyperglycemia and ketoacidosis.
Genetic predisposition and environmental triggers are thought to play a role in this
immune dysfunction.
7. Which neurological disorder is characterized by the demyelination of neurons in the central
nervous system?
A. Parkinson’s Disease
B. Alzheimer’s Disease
C. Amyotrophic Lateral Sclerosis
D. Multiple Sclerosis
Correct Answer: D
Explanation: Multiple Sclerosis is an autoimmune condition where the immune system
attacks the myelin sheath of CNS neurons. This demyelination disrupts the transmission of
nerve impulses leading to varied neurological deficits. Parkinson’s disease involves the loss
of dopaminergic neurons in the substantia nigra. Alzheimer’s is characterized by amyloid
plaques and neurofibrillary tangles. ALS primarily affects motor neurons in both the brain
and the spinal cord.
8. Which type of cell death is characterized by cell shrinkage, chromatin condensation, and
preserved membrane integrity?
A. Necrosis
B. Gangrene
C. Autophagy
D. Apoptosis
Correct Answer: D
Updated and Latest Questions and Correct
Answers with Rationale - Portage Learning
1. A 65-year-old male with a history of long-standing hypertension shows increased thickness
of the left ventricular wall on echocardiography. What cellular adaptation is occurring?
A. Atrophy
B. Metaplasia
C. Hyperplasia
D. Hypertrophy
Correct Answer: D
Explanation: The scenario describes a compensatory response of the heart to an increased
workload from systemic hypertension. Hypertrophy involves an increase in individual cell
size rather than cell number in tissues that cannot divide. Atrophy would involve a
decrease in cell size due to disuse or ischemia. Hyperplasia refers to an increase in the
number of cells which is not typical for cardiac muscle. This specific physiological change
aims to maintain cardiac output against higher peripheral resistance.
2. Which type of hypersensitivity reaction is characterized by the formation of immune
complexes that deposit in vessel walls?
A. Type I
B. Type II
C. Type III
D. Type IV
Correct Answer: C
Explanation: Type III hypersensitivity involves the circulation of antigen-antibody
complexes that settle in tissues like blood vessels. These complexes trigger the complement
system and lead to localized inflammation and tissue damage. Type I is IgE-mediated and
involves immediate allergic responses like anaphylaxis. Type II involves antibodies binding
directly to antigens on specific cell surfaces. Type IV is a delayed-type cell-mediated
response involving T-lymphocytes rather than antibodies.
3. A patient presents with dyspnea, orthopnea, and crackles on lung auscultation. Which
condition is most likely causing these symptoms?
A. Left-sided heart failure
B. Right-sided heart failure
,C. Pulmonary Embolism
D. Chronic Bronchitis
Correct Answer: A
Explanation: Left-sided heart failure leads to pulmonary congestion because the left
ventricle cannot pump blood forward effectively. This causes fluid to back up into the lungs
resulting in pulmonary edema and crackles. Dyspnea and orthopnea are classic signs of
fluid accumulation in the alveolar spaces. Right-sided heart failure typically results in
systemic symptoms like peripheral edema and jugular venous distention. Pulmonary
embolism usually presents with sudden sharp chest pain and acute respiratory distress.
4. What is the primary pathophysiological mechanism behind emphysema?
A. Chronic inflammation of the bronchial tubes
B. Fluid accumulation in the pleural space
C. Hyper-responsiveness of the airways to allergens
D. Destruction of alveolar walls and loss of elastic recoil
Correct Answer: D
Explanation: Emphysema is characterized by the destruction of alveolar walls which
reduces the surface area for gas exchange. The loss of elastic recoil causes air trapping
within the lungs during expiration. Chronic bronchitis involves inflammation and mucus
production in the larger airways. Asthma is characterized by reversible airway hyper-
responsiveness and bronchospasm. Emphysema is often caused by alpha-1 antitrypsin
deficiency or chronic exposure to cigarette smoke.
5. Why do patients with chronic kidney disease (CKD) often develop anemia?
A. Chronic blood loss in the urine
B. Vitamin B12 deficiency due to poor absorption
C. Reduced production of erythropoietin by the kidneys
D. Increased destruction of red blood cells in the spleen
Correct Answer: C
Explanation: The kidneys are responsible for producing erythropoietin which stimulates
red blood cell production in the bone marrow. As renal function declines in CKD, the
production of this hormone decreases significantly. This leads to a normochromic
normocytic anemia despite adequate iron stores. While nutritional deficiencies can occur in
CKD, they are not the primary cause of anemia. Treatment often involves the
administration of synthetic erythropoiesis-stimulating agents.
, 6. In Type 1 Diabetes Mellitus, what is the underlying cause of absolute insulin deficiency?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive secretion of glucagon from alpha cells
D. Down-regulation of insulin receptors
Correct Answer: B
Explanation: Type 1 Diabetes is characterized by an autoimmune attack against the beta
cells in the Islets of Langerhans. This leads to a total lack of endogenous insulin production
by the pancreas. Insulin resistance is the hallmark of Type 2 Diabetes rather than Type 1.
Without insulin, glucose cannot enter cells leading to hyperglycemia and ketoacidosis.
Genetic predisposition and environmental triggers are thought to play a role in this
immune dysfunction.
7. Which neurological disorder is characterized by the demyelination of neurons in the central
nervous system?
A. Parkinson’s Disease
B. Alzheimer’s Disease
C. Amyotrophic Lateral Sclerosis
D. Multiple Sclerosis
Correct Answer: D
Explanation: Multiple Sclerosis is an autoimmune condition where the immune system
attacks the myelin sheath of CNS neurons. This demyelination disrupts the transmission of
nerve impulses leading to varied neurological deficits. Parkinson’s disease involves the loss
of dopaminergic neurons in the substantia nigra. Alzheimer’s is characterized by amyloid
plaques and neurofibrillary tangles. ALS primarily affects motor neurons in both the brain
and the spinal cord.
8. Which type of cell death is characterized by cell shrinkage, chromatin condensation, and
preserved membrane integrity?
A. Necrosis
B. Gangrene
C. Autophagy
D. Apoptosis
Correct Answer: D
