NR 507 Exam 1: Advanced Pathophysiology V2 Updated
and Latest Questions and Correct Answers with Rationale -
Chamberlain University
1. Which cellular adaptation is characterized by a decrease in cell size, often resulting from a
lack of use or nutrient deprivation?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Atrophy
Ans: D
Rationale: Atrophy is the reduction in cellular size due to decreased workload or adverse environmental
conditions. It allows the cell to survive under stress by reducing its metabolic demands significantly. This
process can be physiological, such as the shrinkage of the thymus during childhood development. It can
also be pathological, occurring in skeletal muscles after prolonged immobilization or nerve loss. When
protein synthesis decreases or protein catabolism increases, the cell shrinks to a more efficient state.
Understanding this concept is vital for managing patients with chronic diseases or long-term bed rest.
,2. What is the primary mechanism of cellular injury caused by hypoxia?
A. Increased protein synthesis
B. Decreased intracellular calcium levels
C. Failure of the sodium-potassium pump
D. Alkaline shift in cellular pH
Ans: C
Rationale: Hypoxia leads to a decrease in mitochondrial oxygenation, which sharply reduces ATP
production within the cell. Without adequate ATP, the sodium-potassium membrane pump fails to
maintain the necessary electrochemical gradient. This failure leads to an intracellular accumulation of
sodium and water, causing cellular swelling. Conversely, potassium leaves the cell, which further disrupts
the normal physiological balance of electrolytes. The resulting acidic environment from anaerobic
metabolism can eventually lead to irreversible membrane damage. This cascade of events is the hallmark
of ischemic injury seen in clinical practice.
3. In the context of fluid balance, which force is primarily responsible for pulling water back
into the capillary from the interstitial space?
A. Capillary oncotic pressure
B. Interstitial hydrostatic pressure
C. Capillary hydrostatic pressure
D. Interstitial oncotic pressure
Ans: A
,Rationale: Capillary oncotic pressure is generated by plasma proteins like albumin that remain in the
blood. These proteins create an osmotic pull that draws water from the interstitial fluid into the vessels.
This force acts in opposition to hydrostatic pressure, which pushes fluid out of the capillary. When
albumin levels are low, this pulling force weakens, leading to the formation of edema. Maintaining this
balance is essential for preventing fluid shifts that can lead to tissue swelling. Healthcare providers must
monitor protein levels to assess a patient’s risk for fluid volume imbalances.
4. Which electrolyte imbalance is most commonly associated with peaked T-waves on an
electrocardiogram?
A. Hyperkalemia
B. Hyponatremia
C. Hypocalcemia
D. Hypomagnesemia
Ans: A
Rationale: Hyperkalemia refers to an elevated level of potassium in the extracellular fluid above normal
limits. One of the earliest signs of this condition is the appearance of tall, peaked T-waves on an EKG. This
occurs because high potassium levels alter the repolarization phase of the cardiac action potential. As
potassium rises further, it can lead to dangerous arrhythmias or even sudden cardiac arrest. Clinicians
must recognize these changes immediately to prevent life-threatening complications for the patient.
Treatment usually involves stabilizing the cell membrane and shifting potassium back into the
intracellular space.
, 5. What is the expected compensation mechanism for a patient experiencing metabolic
acidosis?
A. Hypoventilation to retain CO2
B. Decreased renal excretion of hydrogen ions
C. Increased renal excretion of bicarbonate
D. Hyperventilation to blow off CO2
Ans: D
Rationale: In metabolic acidosis, the body attempts to restore pH balance by lowering the concentration
of acid. The respiratory system responds by increasing the rate and depth of breathing, known as
hyperventilation. This process removes carbon dioxide, which reduces the total amount of carbonic acid
in the blood. This compensatory mechanism is relatively fast, often beginning within minutes of the pH
change. Kussmaul respirations are a classic clinical sign of this deep, rapid breathing pattern in diabetic
ketoacidosis. Proper identification of respiratory compensation helps providers determine the
underlying cause of the acid-base disturbance.
and Latest Questions and Correct Answers with Rationale -
Chamberlain University
1. Which cellular adaptation is characterized by a decrease in cell size, often resulting from a
lack of use or nutrient deprivation?
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Atrophy
Ans: D
Rationale: Atrophy is the reduction in cellular size due to decreased workload or adverse environmental
conditions. It allows the cell to survive under stress by reducing its metabolic demands significantly. This
process can be physiological, such as the shrinkage of the thymus during childhood development. It can
also be pathological, occurring in skeletal muscles after prolonged immobilization or nerve loss. When
protein synthesis decreases or protein catabolism increases, the cell shrinks to a more efficient state.
Understanding this concept is vital for managing patients with chronic diseases or long-term bed rest.
,2. What is the primary mechanism of cellular injury caused by hypoxia?
A. Increased protein synthesis
B. Decreased intracellular calcium levels
C. Failure of the sodium-potassium pump
D. Alkaline shift in cellular pH
Ans: C
Rationale: Hypoxia leads to a decrease in mitochondrial oxygenation, which sharply reduces ATP
production within the cell. Without adequate ATP, the sodium-potassium membrane pump fails to
maintain the necessary electrochemical gradient. This failure leads to an intracellular accumulation of
sodium and water, causing cellular swelling. Conversely, potassium leaves the cell, which further disrupts
the normal physiological balance of electrolytes. The resulting acidic environment from anaerobic
metabolism can eventually lead to irreversible membrane damage. This cascade of events is the hallmark
of ischemic injury seen in clinical practice.
3. In the context of fluid balance, which force is primarily responsible for pulling water back
into the capillary from the interstitial space?
A. Capillary oncotic pressure
B. Interstitial hydrostatic pressure
C. Capillary hydrostatic pressure
D. Interstitial oncotic pressure
Ans: A
,Rationale: Capillary oncotic pressure is generated by plasma proteins like albumin that remain in the
blood. These proteins create an osmotic pull that draws water from the interstitial fluid into the vessels.
This force acts in opposition to hydrostatic pressure, which pushes fluid out of the capillary. When
albumin levels are low, this pulling force weakens, leading to the formation of edema. Maintaining this
balance is essential for preventing fluid shifts that can lead to tissue swelling. Healthcare providers must
monitor protein levels to assess a patient’s risk for fluid volume imbalances.
4. Which electrolyte imbalance is most commonly associated with peaked T-waves on an
electrocardiogram?
A. Hyperkalemia
B. Hyponatremia
C. Hypocalcemia
D. Hypomagnesemia
Ans: A
Rationale: Hyperkalemia refers to an elevated level of potassium in the extracellular fluid above normal
limits. One of the earliest signs of this condition is the appearance of tall, peaked T-waves on an EKG. This
occurs because high potassium levels alter the repolarization phase of the cardiac action potential. As
potassium rises further, it can lead to dangerous arrhythmias or even sudden cardiac arrest. Clinicians
must recognize these changes immediately to prevent life-threatening complications for the patient.
Treatment usually involves stabilizing the cell membrane and shifting potassium back into the
intracellular space.
, 5. What is the expected compensation mechanism for a patient experiencing metabolic
acidosis?
A. Hypoventilation to retain CO2
B. Decreased renal excretion of hydrogen ions
C. Increased renal excretion of bicarbonate
D. Hyperventilation to blow off CO2
Ans: D
Rationale: In metabolic acidosis, the body attempts to restore pH balance by lowering the concentration
of acid. The respiratory system responds by increasing the rate and depth of breathing, known as
hyperventilation. This process removes carbon dioxide, which reduces the total amount of carbonic acid
in the blood. This compensatory mechanism is relatively fast, often beginning within minutes of the pH
change. Kussmaul respirations are a classic clinical sign of this deep, rapid breathing pattern in diabetic
ketoacidosis. Proper identification of respiratory compensation helps providers determine the
underlying cause of the acid-base disturbance.
