WGU D236 PATHOPHYSIOLOGY – COMPREHENSIVE QUESTIONS AND ANSWERS | VERIFIED
AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND RATIONALES | COMPLETE
EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM UPDATE
• CORE DOMAINS*
•
• Homeostasis, fluid balance, electrolytes, and acid–base regulation
• Cellular adaptation, cellular injury, genetics, and congenital disorders
• Inflammation, immunity, infection, and tissue repair
• Neoplasia and cancer pathophysiology
• Cardiovascular and hematologic disorders
• Respiratory disorders
• Renal, urinary, and endocrine disorders
• Neurologic and musculoskeletal disorders
• Gastrointestinal, reproductive, and integumentary disorders
• INTRODUCTION*
•
This comprehensive assessment is designed to strengthen understanding of the mechanisms
underlying disease, the body's responses to injury, and the clinical manifestations that result
from disrupted homeostasis. The multiple-choice questions assess foundational knowledge,
terminology, pathophysiologic mechanisms, interpretation of findings, clinical application,
and decision-making. Effective preparation requires more than memorizing disease names:
learners should connect causes with cellular changes, compensatory responses, signs and
symptoms, and likely complications. Scenario-based questions therefore emphasize applying
principles to patient situations. The material is organized to support examination-style
practice while reinforcing the reasoning needed to distinguish closely related disorders and
physiologic processes.
SECTION ONE: QUESTIONS 1–100
HOMEOSTASIS, FLUIDS, ELECTROLYTES, AND ACID–BASE BALANCE
Question 1. Which statement best describes homeostasis?
A. Complete prevention of all physiologic changes
B. Maintenance of a relatively stable internal environment
C. Elimination of external influences on the body
D. Maintenance of identical conditions in every body cell
Correct Answer: B. Maintenance of a relatively stable internal environment
,Explanation: Homeostasis maintains physiologic variables within a functional range despite
internal or external changes. It does not mean that conditions remain completely constant.
Question 2. Which mechanism generally provides the primary means of maintaining
homeostasis?
A. Positive feedback
B. Negative feedback
C. Cellular necrosis
D. Genetic mutation
Correct Answer: B. Negative feedback
Explanation: Negative feedback detects a deviation from a set point and produces responses
that oppose the original change. Examples include temperature and blood-glucose
regulation.
Question 3. Which body-fluid compartment contains the greatest proportion of total body
water?
A. Plasma
B. Interstitial fluid
C. Intracellular fluid
D. Transcellular fluid
Correct Answer: C. Intracellular fluid
Explanation: Intracellular fluid is the fluid contained within cells and represents the largest
body-fluid compartment.
Question 4. A patient develops edema because plasma albumin concentration is markedly
reduced. Which mechanism best explains the edema?
A. Increased plasma oncotic pressure
B. Decreased plasma oncotic pressure
C. Increased intracellular osmotic pressure
D. Increased lymphatic protein removal
Correct Answer: B. Decreased plasma oncotic pressure
Explanation: Albumin contributes substantially to plasma oncotic pressure. When albumin
falls, less fluid is retained within capillaries, promoting movement of fluid into the interstitial
space.
Question 5. Which force primarily pushes fluid out of a capillary?
A. Hydrostatic pressure
B. Oncotic pressure
, C. Plasma protein concentration
D. Intracellular osmotic pressure
Correct Answer: A. Hydrostatic pressure
Explanation: Capillary hydrostatic pressure promotes movement of fluid from the vascular
space into surrounding tissues. Plasma oncotic pressure generally opposes this movement.
Question 6. Which situation is most likely to cause edema through increased hydrostatic
pressure?
A. Severe hypoalbuminemia
B. Left-sided heart failure
C. Increased lymphatic drainage
D. Dehydration
Correct Answer: B. Left-sided heart failure
Explanation: Increased venous and capillary hydrostatic pressure promotes filtration of fluid
into tissues. Heart failure can produce this mechanism of edema.
Question 7. A patient receives excessive hypotonic fluid. Which cellular change is most
likely?
A. Cells shrink because water leaves them
B. Cells swell because water enters them
C. Cells lose potassium exclusively
D. Cells undergo immediate apoptosis
Correct Answer: B. Cells swell because water enters them
Explanation: A hypotonic extracellular environment has a lower effective solute
concentration than the intracellular environment, causing water to move into cells.
Question 8. Which electrolyte is especially important for maintaining extracellular fluid
osmolality and water distribution?
A. Sodium
B. Phosphate
C. Magnesium
D. Iron
Correct Answer: A. Sodium
Explanation: Sodium is the major extracellular cation and is a major determinant of
extracellular osmolality and therefore water distribution.
Question 9. A patient has severe hypernatremia. What happens to brain cells if the
hypernatremia develops rapidly?
AND WELLDETAILED ANSWERS | DETAILED EXPLANATIONS AND RATIONALES | COMPLETE
EXAM PREPARATION STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM UPDATE
• CORE DOMAINS*
•
• Homeostasis, fluid balance, electrolytes, and acid–base regulation
• Cellular adaptation, cellular injury, genetics, and congenital disorders
• Inflammation, immunity, infection, and tissue repair
• Neoplasia and cancer pathophysiology
• Cardiovascular and hematologic disorders
• Respiratory disorders
• Renal, urinary, and endocrine disorders
• Neurologic and musculoskeletal disorders
• Gastrointestinal, reproductive, and integumentary disorders
• INTRODUCTION*
•
This comprehensive assessment is designed to strengthen understanding of the mechanisms
underlying disease, the body's responses to injury, and the clinical manifestations that result
from disrupted homeostasis. The multiple-choice questions assess foundational knowledge,
terminology, pathophysiologic mechanisms, interpretation of findings, clinical application,
and decision-making. Effective preparation requires more than memorizing disease names:
learners should connect causes with cellular changes, compensatory responses, signs and
symptoms, and likely complications. Scenario-based questions therefore emphasize applying
principles to patient situations. The material is organized to support examination-style
practice while reinforcing the reasoning needed to distinguish closely related disorders and
physiologic processes.
SECTION ONE: QUESTIONS 1–100
HOMEOSTASIS, FLUIDS, ELECTROLYTES, AND ACID–BASE BALANCE
Question 1. Which statement best describes homeostasis?
A. Complete prevention of all physiologic changes
B. Maintenance of a relatively stable internal environment
C. Elimination of external influences on the body
D. Maintenance of identical conditions in every body cell
Correct Answer: B. Maintenance of a relatively stable internal environment
,Explanation: Homeostasis maintains physiologic variables within a functional range despite
internal or external changes. It does not mean that conditions remain completely constant.
Question 2. Which mechanism generally provides the primary means of maintaining
homeostasis?
A. Positive feedback
B. Negative feedback
C. Cellular necrosis
D. Genetic mutation
Correct Answer: B. Negative feedback
Explanation: Negative feedback detects a deviation from a set point and produces responses
that oppose the original change. Examples include temperature and blood-glucose
regulation.
Question 3. Which body-fluid compartment contains the greatest proportion of total body
water?
A. Plasma
B. Interstitial fluid
C. Intracellular fluid
D. Transcellular fluid
Correct Answer: C. Intracellular fluid
Explanation: Intracellular fluid is the fluid contained within cells and represents the largest
body-fluid compartment.
Question 4. A patient develops edema because plasma albumin concentration is markedly
reduced. Which mechanism best explains the edema?
A. Increased plasma oncotic pressure
B. Decreased plasma oncotic pressure
C. Increased intracellular osmotic pressure
D. Increased lymphatic protein removal
Correct Answer: B. Decreased plasma oncotic pressure
Explanation: Albumin contributes substantially to plasma oncotic pressure. When albumin
falls, less fluid is retained within capillaries, promoting movement of fluid into the interstitial
space.
Question 5. Which force primarily pushes fluid out of a capillary?
A. Hydrostatic pressure
B. Oncotic pressure
, C. Plasma protein concentration
D. Intracellular osmotic pressure
Correct Answer: A. Hydrostatic pressure
Explanation: Capillary hydrostatic pressure promotes movement of fluid from the vascular
space into surrounding tissues. Plasma oncotic pressure generally opposes this movement.
Question 6. Which situation is most likely to cause edema through increased hydrostatic
pressure?
A. Severe hypoalbuminemia
B. Left-sided heart failure
C. Increased lymphatic drainage
D. Dehydration
Correct Answer: B. Left-sided heart failure
Explanation: Increased venous and capillary hydrostatic pressure promotes filtration of fluid
into tissues. Heart failure can produce this mechanism of edema.
Question 7. A patient receives excessive hypotonic fluid. Which cellular change is most
likely?
A. Cells shrink because water leaves them
B. Cells swell because water enters them
C. Cells lose potassium exclusively
D. Cells undergo immediate apoptosis
Correct Answer: B. Cells swell because water enters them
Explanation: A hypotonic extracellular environment has a lower effective solute
concentration than the intracellular environment, causing water to move into cells.
Question 8. Which electrolyte is especially important for maintaining extracellular fluid
osmolality and water distribution?
A. Sodium
B. Phosphate
C. Magnesium
D. Iron
Correct Answer: A. Sodium
Explanation: Sodium is the major extracellular cation and is a major determinant of
extracellular osmolality and therefore water distribution.
Question 9. A patient has severe hypernatremia. What happens to brain cells if the
hypernatremia develops rapidly?
