BIOL 331 | BIOL331 FINAL EXAM:
PATHOPHYSIOLOGY QUESTIONS &
VERIFIED ANSWERS 2026/2027 UPDATE
1. In the context of cellular adaptation, which process involves the replacement of one
mature cell type by another, often as a response to chronic irritation?
A. Atrophy
B. Metaplasia
C. Hyperplasia
D. Dysplasia
Answer: B
Conceptual Explanation: Metaplasia is a reversible replacement of one mature cell type
by another less mature cell type, such as the change from ciliated columnar epithelium to
stratified squamous epithelium in the lungs of smokers.
2. Which electrolyte imbalance is most commonly associated with the development of
Torsades de Pointes, a life-threatening ventricular tachycardia?
A. Hyperkalemia
B. Hypomagnesemia
C. Hyponatremia
,D. Hypercalcemia
Answer: B
Conceptual Explanation: Hypomagnesemia can prolong the QT interval and predispose
the heart to the polymorphic ventricular tachycardia known as Torsades de Pointes.
3. During the acute phase of inflammation, which cytokine is primarily responsible for
inducing fever by acting on the hypothalamus?
A. Interleukin-10 (IL-10)
B. Interleukin-1 (IL-1)
C. Transforming Growth Factor-beta (TGF-β)
D. Interferon-gamma (IFN-γ)
Answer: B
Conceptual Explanation: IL-1 and TNF-alpha are endogenous pyrogens that stimulate the
synthesis of prostaglandins in the hypothalamus, thereby raising the body’s temperature
set point.
4. A patient presents with a Type I hypersensitivity reaction. Which immunoglobulin is
primarily responsible for the degranulation of mast cells in this process?
A. IgG
B. IgE
C. IgA
, D. IgM
Answer: B
Conceptual Explanation: Type I hypersensitivity is mediated by IgE antibodies that bind
to mast cells. When an allergen cross-links these IgE molecules, the mast cell degranulates,
releasing histamine.
5. What is the primary pathophysiological mechanism behind the development of Type 1
Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive secretion of glucagon by alpha cells
D. Downregulation of GLUT-4 transporters
Answer: B
Conceptual Explanation: Type 1 Diabetes Mellitus is characterized by an autoimmune-
mediated destruction of the insulin-producing beta cells in the Islets of Langerhans, leading
to absolute insulin deficiency.
6. In Chronic Obstructive Pulmonary Disease (COPD), specifically emphysema, what is the
primary cause of alveolar wall destruction?
A. Excessive production of surfactant
B. Chronic bronchoconstriction
PATHOPHYSIOLOGY QUESTIONS &
VERIFIED ANSWERS 2026/2027 UPDATE
1. In the context of cellular adaptation, which process involves the replacement of one
mature cell type by another, often as a response to chronic irritation?
A. Atrophy
B. Metaplasia
C. Hyperplasia
D. Dysplasia
Answer: B
Conceptual Explanation: Metaplasia is a reversible replacement of one mature cell type
by another less mature cell type, such as the change from ciliated columnar epithelium to
stratified squamous epithelium in the lungs of smokers.
2. Which electrolyte imbalance is most commonly associated with the development of
Torsades de Pointes, a life-threatening ventricular tachycardia?
A. Hyperkalemia
B. Hypomagnesemia
C. Hyponatremia
,D. Hypercalcemia
Answer: B
Conceptual Explanation: Hypomagnesemia can prolong the QT interval and predispose
the heart to the polymorphic ventricular tachycardia known as Torsades de Pointes.
3. During the acute phase of inflammation, which cytokine is primarily responsible for
inducing fever by acting on the hypothalamus?
A. Interleukin-10 (IL-10)
B. Interleukin-1 (IL-1)
C. Transforming Growth Factor-beta (TGF-β)
D. Interferon-gamma (IFN-γ)
Answer: B
Conceptual Explanation: IL-1 and TNF-alpha are endogenous pyrogens that stimulate the
synthesis of prostaglandins in the hypothalamus, thereby raising the body’s temperature
set point.
4. A patient presents with a Type I hypersensitivity reaction. Which immunoglobulin is
primarily responsible for the degranulation of mast cells in this process?
A. IgG
B. IgE
C. IgA
, D. IgM
Answer: B
Conceptual Explanation: Type I hypersensitivity is mediated by IgE antibodies that bind
to mast cells. When an allergen cross-links these IgE molecules, the mast cell degranulates,
releasing histamine.
5. What is the primary pathophysiological mechanism behind the development of Type 1
Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Autoimmune destruction of pancreatic beta cells
C. Excessive secretion of glucagon by alpha cells
D. Downregulation of GLUT-4 transporters
Answer: B
Conceptual Explanation: Type 1 Diabetes Mellitus is characterized by an autoimmune-
mediated destruction of the insulin-producing beta cells in the Islets of Langerhans, leading
to absolute insulin deficiency.
6. In Chronic Obstructive Pulmonary Disease (COPD), specifically emphysema, what is the
primary cause of alveolar wall destruction?
A. Excessive production of surfactant
B. Chronic bronchoconstriction
