NUR 631 ADVANCED
PATHOPHYSIOLOGY MIDTERM EXAM
QUESTIONS AND ANSWERS 100%
VERIFIED BY EXPERTS. 2026/2027
1. Which cellular adaptation process is characterized by the replacement of one mature cell
type by another, often less differentiated, cell type?
A. Atrophy
B. Hyperplasia
C. Dysplasia
D. Metaplasia
Answer: D
Conceptual Explanation: Metaplasia is a reversible replacement of one mature cell type
by another, often as a response to chronic irritation, such as the change from ciliated
columnar epithelium to squamous epithelium in the airways of smokers.
2. In the context of cellular injury, what is the primary mechanism by which carbon monoxide
causes tissue hypoxia?
A. Inhibition of ATP production in the mitochondria
B. Direct destruction of red blood cell membranes
,C. Binding to hemoglobin with higher affinity than oxygen
D. Vasoconstriction of peripheral arterioles
Answer: C
Conceptual Explanation: Carbon monoxide has an affinity for hemoglobin that is 200 to
300 times greater than that of oxygen, leading to the formation of carboxyhemoglobin and
preventing oxygen from binding.
3. A patient presents with a serum sodium level of 120 mEq/L. Which pathophysiological
mechanism is most likely responsible for the resulting neurologic symptoms?
A. Intracellular edema as water shifts into the brain cells
B. Shrinkage of neurons due to osmotic water loss
C. Increased excitatory neurotransmitter release
D. Hyperpolarization of the neuronal membrane
Answer: A
Conceptual Explanation: Hyponatremia causes a decrease in ECF osmolality, leading to
the movement of water into the cells (osmosis), which causes cellular swelling and cerebral
edema.
4. Which electrolyte imbalance is most commonly associated with a prolonged QT interval on
an electrocardiogram (ECG)?
A. Hyperkalemia
, B. Hypocalcemia
C. Hypermagnesemia
D. Hypophosphatemia
Answer: B
Conceptual Explanation: Hypocalcemia increases neuromuscular excitability and slows
the movement of calcium into the cell during the plateau phase of the action potential,
prolonging the ST segment and the QT interval.
5. A patient with metabolic acidosis is exhibiting Kussmaul respirations. This respiratory
pattern is an attempt to:
A. Increase the partial pressure of carbon dioxide
B. Retain bicarbonate ions in the kidneys
C. Excrete excess carbonic acid as CO2
D. Decrease the pH of the blood
Answer: C
Conceptual Explanation: Kussmaul respirations are deep and rapid breaths that
represent a respiratory compensation for metabolic acidosis, aimed at blowing off CO2 to
reduce acid load.
PATHOPHYSIOLOGY MIDTERM EXAM
QUESTIONS AND ANSWERS 100%
VERIFIED BY EXPERTS. 2026/2027
1. Which cellular adaptation process is characterized by the replacement of one mature cell
type by another, often less differentiated, cell type?
A. Atrophy
B. Hyperplasia
C. Dysplasia
D. Metaplasia
Answer: D
Conceptual Explanation: Metaplasia is a reversible replacement of one mature cell type
by another, often as a response to chronic irritation, such as the change from ciliated
columnar epithelium to squamous epithelium in the airways of smokers.
2. In the context of cellular injury, what is the primary mechanism by which carbon monoxide
causes tissue hypoxia?
A. Inhibition of ATP production in the mitochondria
B. Direct destruction of red blood cell membranes
,C. Binding to hemoglobin with higher affinity than oxygen
D. Vasoconstriction of peripheral arterioles
Answer: C
Conceptual Explanation: Carbon monoxide has an affinity for hemoglobin that is 200 to
300 times greater than that of oxygen, leading to the formation of carboxyhemoglobin and
preventing oxygen from binding.
3. A patient presents with a serum sodium level of 120 mEq/L. Which pathophysiological
mechanism is most likely responsible for the resulting neurologic symptoms?
A. Intracellular edema as water shifts into the brain cells
B. Shrinkage of neurons due to osmotic water loss
C. Increased excitatory neurotransmitter release
D. Hyperpolarization of the neuronal membrane
Answer: A
Conceptual Explanation: Hyponatremia causes a decrease in ECF osmolality, leading to
the movement of water into the cells (osmosis), which causes cellular swelling and cerebral
edema.
4. Which electrolyte imbalance is most commonly associated with a prolonged QT interval on
an electrocardiogram (ECG)?
A. Hyperkalemia
, B. Hypocalcemia
C. Hypermagnesemia
D. Hypophosphatemia
Answer: B
Conceptual Explanation: Hypocalcemia increases neuromuscular excitability and slows
the movement of calcium into the cell during the plateau phase of the action potential,
prolonging the ST segment and the QT interval.
5. A patient with metabolic acidosis is exhibiting Kussmaul respirations. This respiratory
pattern is an attempt to:
A. Increase the partial pressure of carbon dioxide
B. Retain bicarbonate ions in the kidneys
C. Excrete excess carbonic acid as CO2
D. Decrease the pH of the blood
Answer: C
Conceptual Explanation: Kussmaul respirations are deep and rapid breaths that
represent a respiratory compensation for metabolic acidosis, aimed at blowing off CO2 to
reduce acid load.
