NURS 6501 Advanced Pathophysiology Complete
Exam Bundle – Verified Questions with Rationales |
Walden University 2026 | Midterm & Final Exam Prep
TABLE OF CONTENTS
Section 1: Cellular Biology and Membrane Function Questions 1 to 30
Section 2: Genetics and Chromosomal Disorders Questions 31 to 55
Section 3: Immunity and Inflammation Questions 56 to 80
Section 4: Fluid, Electrolyte, and Acid-Base Balance Questions 81 to 100
Section 5: Cardiovascular Pathophysiology Questions 101 to 130
Section 6: Respiratory Pathophysiology Questions 131 to 150
Section 7: Renal and Endocrine Pathophysiology Questions 151 to 180
Section 8: Neurological Pathophysiology Questions 181 to 210
Section 9: Gastrointestinal and Hepatic Pathophysiology Questions 211 to 235
Section 10: Mixed Review and High-Yield Scenarios Questions 236 to 260
SECTION 1: CELLULAR BIOLOGY AND MEMBRANE FUNCTION
QUESTIONS 1 TO 30
Question 1
A runner has depleted all available oxygen for muscle energy. Which of the
following will facilitate continued muscle performance?
A. Aerobic respiration
B. Creatine phosphate accumulation
C. Anaerobic glycolysis
D. Beta-oxidation of fatty acids
Correct Answer: C
Rationale: Anaerobic glycolysis allows muscle cells to produce ATP without
oxygen by breaking down glucose to pyruvate and then lactate. This process yields
only 2 ATP per glucose versus 36 to 38 ATP with aerobic metabolism, but it
provides rapid energy when oxygen is depleted. Aerobic respiration requires
oxygen. Creatine phosphate provides only brief energy. Beta-oxidation requires
oxygen and occurs in mitochondria.
,Question 2
What causes the rapid change in the resting membrane potential that initiates an
action potential?
A. Potassium gates open and potassium rushes out of the cell
B. Sodium gates open and sodium rushes into the cell
C. Calcium gates open and calcium rushes into the cell
D. Chloride gates open and chloride enters the cell
Correct Answer: B
Rationale: Depolarization occurs when voltage-gated sodium channels open in
response to threshold stimulation, allowing sodium ions to flow down their
electrochemical gradient into the cell. This rapid sodium influx shifts the
membrane potential from approximately -70 mV toward a positive value of +30
mV. Potassium efflux is responsible for repolarization, not depolarization. Calcium
and chloride are not the primary ions for rapid depolarization in neurons.
Question 3
A patient has a genetic defect that causes the sodium-potassium pump to function
at only 20 percent efficiency. What expected finding does the healthcare
professional relate to this defect?
A. Increased intracellular sodium concentration
B. Decreased intracellular sodium concentration
C. Increased intracellular potassium concentration
D. Normal intracellular sodium concentration
Correct Answer: A
Rationale: The sodium-potassium ATPase pump actively transports sodium out of
the cell and potassium into the cell. If the pump functions at reduced efficiency,
sodium accumulates inside the cell. This disrupts the electrochemical gradient
essential for nerve impulse transmission and osmotic balance. Decreased
intracellular sodium would occur with increased pump efficiency. Potassium
concentration would decrease, not increase.
Question 4
How are potassium and sodium transported across plasma membranes?
,A. By simple diffusion
B. By facilitated diffusion through ion channels
C. By adenosine triphosphate enzyme ATPase activity
D. By osmosis
Correct Answer: C
Rationale: The Na+/K+ ATPase pump actively transports 3 sodium ions out of the
cell and 2 potassium ions into the cell against their concentration gradients. This
requires ATP energy and maintains the electrochemical gradient essential for
cellular function. Simple diffusion and facilitated diffusion are passive processes
that do not require energy. Osmosis is water movement, not ion transport.
Question 5
The ion transporter that moves sodium and calcium simultaneously in the same
direction is an example of which type of transport?
A. Antiport
B. Symport
C. Uniport
D. Primary active transport
Correct Answer: B
Rationale: Symport is a type of coupled transport where two or more different
molecules or ions are transported in the same direction across a membrane. When
sodium and calcium move together in the same direction, it exemplifies symport.
Antiport moves substances in opposite directions. Uniport moves a single
substance. Primary active transport directly uses ATP.
Question 6
The early dilation or swelling of the cell's endoplasmic reticulum results in which
of the following?
A. Increased protein synthesis
B. Reduced protein synthesis
C. Enhanced lipid metabolism
D. Rapid cell division
Correct Answer: B
, Rationale: The rough endoplasmic reticulum is responsible for protein synthesis
and contains ribosomes. Swelling and degranulation of the ER disrupts protein
synthesis machinery, leading to reduced production of essential proteins. This is an
early sign of cellular injury that precedes more severe damage. Protein synthesis
decreases, not increases. Lipid metabolism and cell division are not directly
affected by ER swelling.
Question 7
What is the role of cytokines in cell reproduction?
A. They directly replicate DNA
B. Provide growth factor for tissue growth and development
C. They function as structural proteins
D. They inhibit cell division
Correct Answer: B
Rationale: Cytokines are signaling proteins that regulate cell growth,
differentiation, and proliferation. They serve as growth factors that stimulate tissue
development and repair. Examples include interleukins, interferons, and growth
factors that bind to cell surface receptors and activate intracellular signaling
cascades leading to cell division. Cytokines do not directly replicate DNA,
function as structural proteins, or inhibit cell division.
Question 8
A eukaryotic cell is undergoing DNA replication. In which region of the cell
would most of the genetic information be contained?
A. Cytoplasm
B. Nucleolus
C. Endoplasmic reticulum
D. Mitochondria
Correct Answer: B
Rationale: The nucleolus is located within the nucleus and contains the genetic
material organized as chromosomes. While mitochondria contain their own small
amount of DNA, the vast majority of genetic information resides in the nucleus.
DNA replication occurs in the nucleus before cell division. The cytoplasm and
endoplasmic reticulum do not contain the primary genetic material.
Exam Bundle – Verified Questions with Rationales |
Walden University 2026 | Midterm & Final Exam Prep
TABLE OF CONTENTS
Section 1: Cellular Biology and Membrane Function Questions 1 to 30
Section 2: Genetics and Chromosomal Disorders Questions 31 to 55
Section 3: Immunity and Inflammation Questions 56 to 80
Section 4: Fluid, Electrolyte, and Acid-Base Balance Questions 81 to 100
Section 5: Cardiovascular Pathophysiology Questions 101 to 130
Section 6: Respiratory Pathophysiology Questions 131 to 150
Section 7: Renal and Endocrine Pathophysiology Questions 151 to 180
Section 8: Neurological Pathophysiology Questions 181 to 210
Section 9: Gastrointestinal and Hepatic Pathophysiology Questions 211 to 235
Section 10: Mixed Review and High-Yield Scenarios Questions 236 to 260
SECTION 1: CELLULAR BIOLOGY AND MEMBRANE FUNCTION
QUESTIONS 1 TO 30
Question 1
A runner has depleted all available oxygen for muscle energy. Which of the
following will facilitate continued muscle performance?
A. Aerobic respiration
B. Creatine phosphate accumulation
C. Anaerobic glycolysis
D. Beta-oxidation of fatty acids
Correct Answer: C
Rationale: Anaerobic glycolysis allows muscle cells to produce ATP without
oxygen by breaking down glucose to pyruvate and then lactate. This process yields
only 2 ATP per glucose versus 36 to 38 ATP with aerobic metabolism, but it
provides rapid energy when oxygen is depleted. Aerobic respiration requires
oxygen. Creatine phosphate provides only brief energy. Beta-oxidation requires
oxygen and occurs in mitochondria.
,Question 2
What causes the rapid change in the resting membrane potential that initiates an
action potential?
A. Potassium gates open and potassium rushes out of the cell
B. Sodium gates open and sodium rushes into the cell
C. Calcium gates open and calcium rushes into the cell
D. Chloride gates open and chloride enters the cell
Correct Answer: B
Rationale: Depolarization occurs when voltage-gated sodium channels open in
response to threshold stimulation, allowing sodium ions to flow down their
electrochemical gradient into the cell. This rapid sodium influx shifts the
membrane potential from approximately -70 mV toward a positive value of +30
mV. Potassium efflux is responsible for repolarization, not depolarization. Calcium
and chloride are not the primary ions for rapid depolarization in neurons.
Question 3
A patient has a genetic defect that causes the sodium-potassium pump to function
at only 20 percent efficiency. What expected finding does the healthcare
professional relate to this defect?
A. Increased intracellular sodium concentration
B. Decreased intracellular sodium concentration
C. Increased intracellular potassium concentration
D. Normal intracellular sodium concentration
Correct Answer: A
Rationale: The sodium-potassium ATPase pump actively transports sodium out of
the cell and potassium into the cell. If the pump functions at reduced efficiency,
sodium accumulates inside the cell. This disrupts the electrochemical gradient
essential for nerve impulse transmission and osmotic balance. Decreased
intracellular sodium would occur with increased pump efficiency. Potassium
concentration would decrease, not increase.
Question 4
How are potassium and sodium transported across plasma membranes?
,A. By simple diffusion
B. By facilitated diffusion through ion channels
C. By adenosine triphosphate enzyme ATPase activity
D. By osmosis
Correct Answer: C
Rationale: The Na+/K+ ATPase pump actively transports 3 sodium ions out of the
cell and 2 potassium ions into the cell against their concentration gradients. This
requires ATP energy and maintains the electrochemical gradient essential for
cellular function. Simple diffusion and facilitated diffusion are passive processes
that do not require energy. Osmosis is water movement, not ion transport.
Question 5
The ion transporter that moves sodium and calcium simultaneously in the same
direction is an example of which type of transport?
A. Antiport
B. Symport
C. Uniport
D. Primary active transport
Correct Answer: B
Rationale: Symport is a type of coupled transport where two or more different
molecules or ions are transported in the same direction across a membrane. When
sodium and calcium move together in the same direction, it exemplifies symport.
Antiport moves substances in opposite directions. Uniport moves a single
substance. Primary active transport directly uses ATP.
Question 6
The early dilation or swelling of the cell's endoplasmic reticulum results in which
of the following?
A. Increased protein synthesis
B. Reduced protein synthesis
C. Enhanced lipid metabolism
D. Rapid cell division
Correct Answer: B
, Rationale: The rough endoplasmic reticulum is responsible for protein synthesis
and contains ribosomes. Swelling and degranulation of the ER disrupts protein
synthesis machinery, leading to reduced production of essential proteins. This is an
early sign of cellular injury that precedes more severe damage. Protein synthesis
decreases, not increases. Lipid metabolism and cell division are not directly
affected by ER swelling.
Question 7
What is the role of cytokines in cell reproduction?
A. They directly replicate DNA
B. Provide growth factor for tissue growth and development
C. They function as structural proteins
D. They inhibit cell division
Correct Answer: B
Rationale: Cytokines are signaling proteins that regulate cell growth,
differentiation, and proliferation. They serve as growth factors that stimulate tissue
development and repair. Examples include interleukins, interferons, and growth
factors that bind to cell surface receptors and activate intracellular signaling
cascades leading to cell division. Cytokines do not directly replicate DNA,
function as structural proteins, or inhibit cell division.
Question 8
A eukaryotic cell is undergoing DNA replication. In which region of the cell
would most of the genetic information be contained?
A. Cytoplasm
B. Nucleolus
C. Endoplasmic reticulum
D. Mitochondria
Correct Answer: B
Rationale: The nucleolus is located within the nucleus and contains the genetic
material organized as chromosomes. While mitochondria contain their own small
amount of DNA, the vast majority of genetic information resides in the nucleus.
DNA replication occurs in the nucleus before cell division. The cytoplasm and
endoplasmic reticulum do not contain the primary genetic material.
