HSC 4555 Final Exam V2 | HSC 4555 Pathophysiology 1 | Actual Q&A
with Rationale (HSC4555 Final Exam) | University of Central Florida
1. A patient with long-standing hypertension presents with an enlarged left ventricle on an
echocardiogram. Which cellular adaptation is most likely responsible for this finding?
A. Metaplasia
B. Hypertrophy
C. Hyperplasia
D. Atrophy
Answer: B
Explanation: Hypertrophy involves an increase in the size of individual cells, which leads
to an overall increase in the size of the organ. In the heart, this is a common response to the
increased workload required to pump blood against high systemic pressure. Cardiac
myocytes are generally unable to undergo hyperplasia, making hypertrophy the primary
adaptive mechanism in this tissue.
2. During the early stages of acute inflammation, which chemical mediator is primarily
responsible for inducing vasodilation and increased capillary permeability?
A. Interleukin-1
C. Histamine
B. Leukotrienes
D. Complement C5a
Answer: C
Explanation: Histamine is stored in mast cell granules and is one of the first mediators
released during an inflammatory response. It acts quickly on the endothelium to cause
contraction, resulting in increased vascular permeability and localized edema. This process
facilitates the migration of leukocytes from the blood into the interstitial space.
3. An arterial blood gas (ABG) analysis reveals the following: pH 7.28, PaCO2 52 mmHg, and
HCO3 25 mEq/L. How should the nurse interpret these findings?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Alkalosis
D. Respiratory Acidosis
,Answer: D
Explanation: A pH below 7.35 indicates acidosis, and a PaCO2 above 45 mmHg indicates a
respiratory cause for the pH shift. Since the bicarbonate level is within the normal range
(22-26 mEq/L), there is no evidence of metabolic compensation. This pattern is typically
seen in clinical conditions that cause hypoventilation, such as COPD or CNS depression.
4. Which characteristic is a hallmark feature of malignant tumors that distinguishes them
from benign tumors?
A. Ability to metastasize
B. Well-differentiated cells
C. Encapsulation
D. Slow growth rate
Answer: A
Explanation: Malignant tumors are characterized by their ability to invade surrounding
tissues and spread to distant sites through blood or lymphatic vessels. Benign tumors
generally remain localized and are often encapsulated, preventing invasive growth. The
lack of cell differentiation, or anaplasia, is also a key marker of malignancy.
5. A patient exhibits muscle weakness and the presence of U-waves on an electrocardiogram
(ECG). Which electrolyte imbalance should the clinician suspect?
A. Hypernatremia
B. Hypokalemia
C. Hypermagnesemia
D. Hypocalcemia
Answer: B
Explanation: Hypokalemia, defined as a low serum potassium level, significantly impacts
the resting membrane potential of muscle and nerve cells. Common ECG changes include
flattened T-waves and the appearance of prominent U-waves. Muscle weakness and cardiac
dysrhythmias are the most critical clinical manifestations of this imbalance.
6. What is the underlying pathophysiology of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon secretion by alpha cells
D. Obesity-induced downregulation of insulin receptors
Answer: A
, Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
due to the destruction of insulin-producing beta cells in the Islets of Langerhans. This is
typically a T-cell mediated autoimmune process that occurs in genetically susceptible
individuals. Consequently, patients require exogenous insulin for survival to prevent
ketoacidosis.
7. Which genetic condition is characterized by the presence of an extra copy of chromosome
21?
A. Turner Syndrome
B. Klinefelter Syndrome
C. Down Syndrome
D. Edward Syndrome
Answer: C
Explanation: Down Syndrome, or Trisomy 21, occurs when an individual has three copies
of chromosome 21 instead of two. This usually results from nondisjunction during meiosis,
particularly in maternal oocytes. It is associated with distinct physical features, intellectual
disability, and an increased risk of congenital heart defects.
8. A patient experiences a severe allergic reaction to a bee sting, characterized by
bronchospasm and hypotension. This is an example of which type of hypersensitivity?
A. Type II (Cytotoxic)
B. Type III (Immune Complex)
C. Type I (Immediate)
D. Type IV (Delayed)
Answer: C
Explanation: Type I hypersensitivity reactions are IgE-mediated and occur rapidly after
exposure to an antigen. Mast cells release large amounts of histamine and other
inflammatory mediators, leading to systemic vasodilation and airway constriction.
Anaphylaxis is the most severe and life-threatening form of this reaction type.
9. Acute Tubular Necrosis (ATN) is a common cause of intrarenal acute kidney injury. Which
factor is a frequent etiology for this condition?
A. Prolonged renal ischemia
B. Benign prostatic hyperplasia
C. Renal artery stenosis
D. Hypovolemia leading to pre-renal azotemia
with Rationale (HSC4555 Final Exam) | University of Central Florida
1. A patient with long-standing hypertension presents with an enlarged left ventricle on an
echocardiogram. Which cellular adaptation is most likely responsible for this finding?
A. Metaplasia
B. Hypertrophy
C. Hyperplasia
D. Atrophy
Answer: B
Explanation: Hypertrophy involves an increase in the size of individual cells, which leads
to an overall increase in the size of the organ. In the heart, this is a common response to the
increased workload required to pump blood against high systemic pressure. Cardiac
myocytes are generally unable to undergo hyperplasia, making hypertrophy the primary
adaptive mechanism in this tissue.
2. During the early stages of acute inflammation, which chemical mediator is primarily
responsible for inducing vasodilation and increased capillary permeability?
A. Interleukin-1
C. Histamine
B. Leukotrienes
D. Complement C5a
Answer: C
Explanation: Histamine is stored in mast cell granules and is one of the first mediators
released during an inflammatory response. It acts quickly on the endothelium to cause
contraction, resulting in increased vascular permeability and localized edema. This process
facilitates the migration of leukocytes from the blood into the interstitial space.
3. An arterial blood gas (ABG) analysis reveals the following: pH 7.28, PaCO2 52 mmHg, and
HCO3 25 mEq/L. How should the nurse interpret these findings?
A. Metabolic Acidosis
B. Metabolic Alkalosis
C. Respiratory Alkalosis
D. Respiratory Acidosis
,Answer: D
Explanation: A pH below 7.35 indicates acidosis, and a PaCO2 above 45 mmHg indicates a
respiratory cause for the pH shift. Since the bicarbonate level is within the normal range
(22-26 mEq/L), there is no evidence of metabolic compensation. This pattern is typically
seen in clinical conditions that cause hypoventilation, such as COPD or CNS depression.
4. Which characteristic is a hallmark feature of malignant tumors that distinguishes them
from benign tumors?
A. Ability to metastasize
B. Well-differentiated cells
C. Encapsulation
D. Slow growth rate
Answer: A
Explanation: Malignant tumors are characterized by their ability to invade surrounding
tissues and spread to distant sites through blood or lymphatic vessels. Benign tumors
generally remain localized and are often encapsulated, preventing invasive growth. The
lack of cell differentiation, or anaplasia, is also a key marker of malignancy.
5. A patient exhibits muscle weakness and the presence of U-waves on an electrocardiogram
(ECG). Which electrolyte imbalance should the clinician suspect?
A. Hypernatremia
B. Hypokalemia
C. Hypermagnesemia
D. Hypocalcemia
Answer: B
Explanation: Hypokalemia, defined as a low serum potassium level, significantly impacts
the resting membrane potential of muscle and nerve cells. Common ECG changes include
flattened T-waves and the appearance of prominent U-waves. Muscle weakness and cardiac
dysrhythmias are the most critical clinical manifestations of this imbalance.
6. What is the underlying pathophysiology of Type 1 Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Excessive glucagon secretion by alpha cells
D. Obesity-induced downregulation of insulin receptors
Answer: A
, Explanation: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
due to the destruction of insulin-producing beta cells in the Islets of Langerhans. This is
typically a T-cell mediated autoimmune process that occurs in genetically susceptible
individuals. Consequently, patients require exogenous insulin for survival to prevent
ketoacidosis.
7. Which genetic condition is characterized by the presence of an extra copy of chromosome
21?
A. Turner Syndrome
B. Klinefelter Syndrome
C. Down Syndrome
D. Edward Syndrome
Answer: C
Explanation: Down Syndrome, or Trisomy 21, occurs when an individual has three copies
of chromosome 21 instead of two. This usually results from nondisjunction during meiosis,
particularly in maternal oocytes. It is associated with distinct physical features, intellectual
disability, and an increased risk of congenital heart defects.
8. A patient experiences a severe allergic reaction to a bee sting, characterized by
bronchospasm and hypotension. This is an example of which type of hypersensitivity?
A. Type II (Cytotoxic)
B. Type III (Immune Complex)
C. Type I (Immediate)
D. Type IV (Delayed)
Answer: C
Explanation: Type I hypersensitivity reactions are IgE-mediated and occur rapidly after
exposure to an antigen. Mast cells release large amounts of histamine and other
inflammatory mediators, leading to systemic vasodilation and airway constriction.
Anaphylaxis is the most severe and life-threatening form of this reaction type.
9. Acute Tubular Necrosis (ATN) is a common cause of intrarenal acute kidney injury. Which
factor is a frequent etiology for this condition?
A. Prolonged renal ischemia
B. Benign prostatic hyperplasia
C. Renal artery stenosis
D. Hypovolemia leading to pre-renal azotemia
