Question 1:
Which of the following is the primary mechanism by which tissue
ischemia leads to cellular injury?
A) Decreased ATP production
B) Increased intracellular calcium
C) Increased oxidative stress
D) Decreased glucose uptake
Answer: A) Decreased ATP production
Rationale: Ischemia leads to a decrease in oxygen supply, which
significantly reduces ATP production. ATP is essential for maintaining
cellular homeostasis, and its depletion causes disruption of the Na+/K+
ATPase pump, leading to cellular swelling and dysfunction. Increased
intracellular calcium also occurs due to ischemia, but the primary cause
is ATP depletion.
Question 2:
In the pathogenesis of atherosclerosis, which of the following is the
first step in the process of plaque formation?
A) Formation of foam cells
B) Endothelial injury
C) Smooth muscle migration
D) Lipid accumulation
Answer: B) Endothelial injury
Rationale: The process of atherosclerosis begins with endothelial injury,
which exposes the underlying subendothelial tissue to circulating
lipoproteins, particularly low-density lipoprotein (LDL). This injury leads
to the recruitment of inflammatory cells and smooth muscle cells,
ultimately resulting in plaque formation.
,Question 3:
Which of the following is a characteristic feature of acute
inflammation?
A) Formation of granulomas
B) Infiltration of neutrophils
C) Fibrosis and scarring
D) Chronic lymphocytic infiltration
Answer: B) Infiltration of neutrophils
Rationale: Acute inflammation is typically characterized by the rapid
infiltration of neutrophils to the site of injury or infection. Granulomas,
fibrosis, and chronic lymphocytic infiltration are features more
associated with chronic inflammation.
Question 4:
In autoimmune diseases, which of the following is most likely
responsible for the pathogenesis of tissue injury?
A) Type III hypersensitivity reaction
B) Type I hypersensitivity reaction
C) Type IV hypersensitivity reaction
D) Type II hypersensitivity reaction
Answer: A) Type III hypersensitivity reaction
Rationale: Type III hypersensitivity reactions involve the formation of
immune complexes that deposit in tissues and activate complement,
leading to inflammation and tissue injury. While Type I involves IgE-
mediated reactions and Type II involves direct antibody-mediated
cytotoxicity, Type III is most commonly associated with autoimmune
diseases like systemic lupus erythematosus (SLE).
Question 5:
, Which of the following is an example of a primary immune deficiency
disorder?
A) Rheumatoid arthritis
B) Human immunodeficiency virus (HIV) infection
C) Severe combined immunodeficiency (SCID)
D) Type 1 diabetes mellitus
Answer: C) Severe combined immunodeficiency (SCID)
Rationale: SCID is a congenital (primary) immune deficiency disorder,
where there is a defect in the development and function of both T and
B lymphocytes. HIV and rheumatoid arthritis are secondary immune
disorders, while Type 1 diabetes mellitus is an autoimmune disorder.
Question 6:
Which of the following is a hallmark of malignant tumors in terms of
cellular characteristics?
A) Uncontrolled apoptosis
B) Well-differentiated cells
C) Invasiveness and metastasis
D) Slow rate of cell division
Answer: C) Invasiveness and metastasis
Rationale: Malignant tumors are characterized by their ability to invade
surrounding tissues and metastasize to distant organs. They exhibit
rapid cell division, often with poor differentiation, and have an impaired
ability to undergo apoptosis. These features contribute to their
aggressive nature.
Question 7:
Which of the following is the primary mechanism by which tissue
ischemia leads to cellular injury?
A) Decreased ATP production
B) Increased intracellular calcium
C) Increased oxidative stress
D) Decreased glucose uptake
Answer: A) Decreased ATP production
Rationale: Ischemia leads to a decrease in oxygen supply, which
significantly reduces ATP production. ATP is essential for maintaining
cellular homeostasis, and its depletion causes disruption of the Na+/K+
ATPase pump, leading to cellular swelling and dysfunction. Increased
intracellular calcium also occurs due to ischemia, but the primary cause
is ATP depletion.
Question 2:
In the pathogenesis of atherosclerosis, which of the following is the
first step in the process of plaque formation?
A) Formation of foam cells
B) Endothelial injury
C) Smooth muscle migration
D) Lipid accumulation
Answer: B) Endothelial injury
Rationale: The process of atherosclerosis begins with endothelial injury,
which exposes the underlying subendothelial tissue to circulating
lipoproteins, particularly low-density lipoprotein (LDL). This injury leads
to the recruitment of inflammatory cells and smooth muscle cells,
ultimately resulting in plaque formation.
,Question 3:
Which of the following is a characteristic feature of acute
inflammation?
A) Formation of granulomas
B) Infiltration of neutrophils
C) Fibrosis and scarring
D) Chronic lymphocytic infiltration
Answer: B) Infiltration of neutrophils
Rationale: Acute inflammation is typically characterized by the rapid
infiltration of neutrophils to the site of injury or infection. Granulomas,
fibrosis, and chronic lymphocytic infiltration are features more
associated with chronic inflammation.
Question 4:
In autoimmune diseases, which of the following is most likely
responsible for the pathogenesis of tissue injury?
A) Type III hypersensitivity reaction
B) Type I hypersensitivity reaction
C) Type IV hypersensitivity reaction
D) Type II hypersensitivity reaction
Answer: A) Type III hypersensitivity reaction
Rationale: Type III hypersensitivity reactions involve the formation of
immune complexes that deposit in tissues and activate complement,
leading to inflammation and tissue injury. While Type I involves IgE-
mediated reactions and Type II involves direct antibody-mediated
cytotoxicity, Type III is most commonly associated with autoimmune
diseases like systemic lupus erythematosus (SLE).
Question 5:
, Which of the following is an example of a primary immune deficiency
disorder?
A) Rheumatoid arthritis
B) Human immunodeficiency virus (HIV) infection
C) Severe combined immunodeficiency (SCID)
D) Type 1 diabetes mellitus
Answer: C) Severe combined immunodeficiency (SCID)
Rationale: SCID is a congenital (primary) immune deficiency disorder,
where there is a defect in the development and function of both T and
B lymphocytes. HIV and rheumatoid arthritis are secondary immune
disorders, while Type 1 diabetes mellitus is an autoimmune disorder.
Question 6:
Which of the following is a hallmark of malignant tumors in terms of
cellular characteristics?
A) Uncontrolled apoptosis
B) Well-differentiated cells
C) Invasiveness and metastasis
D) Slow rate of cell division
Answer: C) Invasiveness and metastasis
Rationale: Malignant tumors are characterized by their ability to invade
surrounding tissues and metastasize to distant organs. They exhibit
rapid cell division, often with poor differentiation, and have an impaired
ability to undergo apoptosis. These features contribute to their
aggressive nature.
Question 7:
