W E S T E R N G O V E R N O R S U N I V E R S I T Y · C O L L E G E O F H E A LT H P R O F E S S I O N S
WGU D236
Pathophysiology
Comprehensive Practice
Bank
Extended Review — Fluids, Electrolytes, Acid-Base, Genetics, Bone, Joint
& Muscle
Course: Pathophysiology
Edition 1 · September 2026
Table of Contents
1. Instructions for Use 2
2. Practice Questions with Answers & Rationales — Pathophysiology 2
WGU D236 · Western Governors University Page 1
,WGU D236 PATHOPHYSIOLOGY PRACTICE GUIDE INSTRUCTIONS & PRACTICE QUESTIONS
How to Use This Guide
This comprehensive review contains 135 practice questions covering key concepts from WGU
D236 Pathophysiology. Each question includes four answer choices, a clearly marked correct
answer, and a detailed clinical rationale explaining the underlying pathophysiology.
Category: Comprehensive Pathophysiology — Fluids, Electrolytes, Acid-
Base, Genetics, Bone, Joint & Muscle
1 How much of the body's water is in ICF (intracellular fluid)?
A 1/3
B 2/3
C 1/4
D 3/4
Why B is correct: Approximately two-thirds (2/3) of the body's total water is contained
within the intracellular fluid (ICF) compartment. The remaining one-third is in the
extracellular fluid (ECF) compartment.
A — 1/3 is the proportion of ECF, not ICF.
C — 1/4 is incorrect.
D — 3/4 is incorrect.
,2 What are the 2 main ECF compartments?
A Intravascular and transcellular
B Interstitial fluid and intravascular fluid (blood plasma)
C Plasma and lymph
D ICF and ECF
Why B is correct: The two main extracellular fluid (ECF) compartments are interstitial fluid
(fluid between cells) and intravascular fluid (blood plasma within blood vessels).
A — Transcellular is a smaller ECF compartment.
C — Lymph is part of the interstitial fluid.
D — ICF and ECF are the two major fluid compartments, but the question asks for ECF
compartments specifically.
3 TBW stands for:
A Total Blood Weight
B Total Body Water
C Total Body Weight
D Total Biological Water
Why B is correct: TBW stands for Total Body Water, which refers to the total amount of
water in the body, distributed between intracellular and extracellular compartments.
A — This is not a standard abbreviation.
C — Total Body Weight is different.
D — This is not a standard abbreviation.
, 4 TBW in infants is approximately what percentage of body weight?
A 50-60%
B 60-65%
C 70-80%
D 80-90%
Why C is correct: Total body water in infants is approximately 70-80% of body weight,
which is higher than adults due to lower body fat and higher metabolic rate.
A — This is too low for infants.
B — This is the percentage in older children.
D — This is too high.
5 During childhood, TBW slowly decreases to what percentage of body weight?
A 50-55%
B 60-65%
C 65-70%
D 70-75%
Why B is correct: During childhood, total body water slowly decreases to approximately
60% to 65% of body weight, approaching adult levels as body fat increases.
A — This is too low for children.
C — This is higher than childhood levels.
D — This is infant level.
WGU D236
Pathophysiology
Comprehensive Practice
Bank
Extended Review — Fluids, Electrolytes, Acid-Base, Genetics, Bone, Joint
& Muscle
Course: Pathophysiology
Edition 1 · September 2026
Table of Contents
1. Instructions for Use 2
2. Practice Questions with Answers & Rationales — Pathophysiology 2
WGU D236 · Western Governors University Page 1
,WGU D236 PATHOPHYSIOLOGY PRACTICE GUIDE INSTRUCTIONS & PRACTICE QUESTIONS
How to Use This Guide
This comprehensive review contains 135 practice questions covering key concepts from WGU
D236 Pathophysiology. Each question includes four answer choices, a clearly marked correct
answer, and a detailed clinical rationale explaining the underlying pathophysiology.
Category: Comprehensive Pathophysiology — Fluids, Electrolytes, Acid-
Base, Genetics, Bone, Joint & Muscle
1 How much of the body's water is in ICF (intracellular fluid)?
A 1/3
B 2/3
C 1/4
D 3/4
Why B is correct: Approximately two-thirds (2/3) of the body's total water is contained
within the intracellular fluid (ICF) compartment. The remaining one-third is in the
extracellular fluid (ECF) compartment.
A — 1/3 is the proportion of ECF, not ICF.
C — 1/4 is incorrect.
D — 3/4 is incorrect.
,2 What are the 2 main ECF compartments?
A Intravascular and transcellular
B Interstitial fluid and intravascular fluid (blood plasma)
C Plasma and lymph
D ICF and ECF
Why B is correct: The two main extracellular fluid (ECF) compartments are interstitial fluid
(fluid between cells) and intravascular fluid (blood plasma within blood vessels).
A — Transcellular is a smaller ECF compartment.
C — Lymph is part of the interstitial fluid.
D — ICF and ECF are the two major fluid compartments, but the question asks for ECF
compartments specifically.
3 TBW stands for:
A Total Blood Weight
B Total Body Water
C Total Body Weight
D Total Biological Water
Why B is correct: TBW stands for Total Body Water, which refers to the total amount of
water in the body, distributed between intracellular and extracellular compartments.
A — This is not a standard abbreviation.
C — Total Body Weight is different.
D — This is not a standard abbreviation.
, 4 TBW in infants is approximately what percentage of body weight?
A 50-60%
B 60-65%
C 70-80%
D 80-90%
Why C is correct: Total body water in infants is approximately 70-80% of body weight,
which is higher than adults due to lower body fat and higher metabolic rate.
A — This is too low for infants.
B — This is the percentage in older children.
D — This is too high.
5 During childhood, TBW slowly decreases to what percentage of body weight?
A 50-55%
B 60-65%
C 65-70%
D 70-75%
Why B is correct: During childhood, total body water slowly decreases to approximately
60% to 65% of body weight, approaching adult levels as body fat increases.
A — This is too low for children.
C — This is higher than childhood levels.
D — This is infant level.
