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WGU D236
Pathophysiology
Complete Study Guide
NCLEX-Style Practice Questions with Detailed Rationales
Topic Focus: Pathophysiology — Comprehensive Review
Complete Edition · September 2026
Table of Contents
1. Instructions for Use 2
2. Fluid & Electrolyte Balance 2
3. Acid-Base Balance 4
4. Immunity & Inflammation 6
,5. Genetic Disorders 8
6. Musculoskeletal System 10
7. Integumentary System 12
WGU D236 · Western Governors University Page 1
,WGU D236 PATHOPHYSIOLOGY STUDY GUIDE INSTRUCTIONS & QUESTIONS
How to Use This Guide
Read each stem, choose your answer, then check the rationale directly below it. The correct
option is marked, and each wrong option is explained so you understand why it's wrong — not
just that it is. This guide contains all 200+ source items converted into NCLEX-style questions
with detailed rationales.
Fluid & Electrolyte Balance
1 What is the process by which organisms maintain a relatively stable internal
environment?
A Diffusion
B Osmosis
C Homeostasis
D Filtration
Why C is correct: Homeostasis is the process by which organisms maintain a relatively
stable internal environment despite external changes.
A — Diffusion is the movement of molecules from high to low concentration, not the overall
maintenance of internal stability.
B — Osmosis is the movement of water across a membrane, not the general process of
maintaining stability.
D — Filtration is the movement of water and solutes due to hydrostatic pressure, not the
maintenance of internal stability.
, 2 Intracellular fluid accounts for approximately what proportion of body weight?
A 1/3 of body weight
B 2/3 of body weight
C 1/4 of body weight
D 1/2 of body weight
Why B is correct: Intracellular fluid comprises approximately 2/3 of total body water and is
mainly located within muscle cells.
A — 1/3 of body weight represents extracellular fluid, not intracellular fluid.
C — 1/4 of body weight is not the correct proportion for intracellular fluid.
D — 1/2 of body weight is not the correct proportion; intracellular fluid is 2/3 of total body
water.
3 Extracellular fluid (ECF) is found in which of the following locations?
A Inside muscle cells
B Blood vessels, skin tissues, and spinal cord
C Within bone marrow
D Inside the nucleus of cells
Why B is correct: Extracellular fluid is found outside of cells in blood vessels, skin tissues,
and the spinal cord.
A — Inside muscle cells is where intracellular fluid is located, not extracellular fluid.
C — Bone marrow is not a primary location for extracellular fluid.
D — The nucleus contains intracellular fluid, not extracellular fluid.
WGU D236
Pathophysiology
Complete Study Guide
NCLEX-Style Practice Questions with Detailed Rationales
Topic Focus: Pathophysiology — Comprehensive Review
Complete Edition · September 2026
Table of Contents
1. Instructions for Use 2
2. Fluid & Electrolyte Balance 2
3. Acid-Base Balance 4
4. Immunity & Inflammation 6
,5. Genetic Disorders 8
6. Musculoskeletal System 10
7. Integumentary System 12
WGU D236 · Western Governors University Page 1
,WGU D236 PATHOPHYSIOLOGY STUDY GUIDE INSTRUCTIONS & QUESTIONS
How to Use This Guide
Read each stem, choose your answer, then check the rationale directly below it. The correct
option is marked, and each wrong option is explained so you understand why it's wrong — not
just that it is. This guide contains all 200+ source items converted into NCLEX-style questions
with detailed rationales.
Fluid & Electrolyte Balance
1 What is the process by which organisms maintain a relatively stable internal
environment?
A Diffusion
B Osmosis
C Homeostasis
D Filtration
Why C is correct: Homeostasis is the process by which organisms maintain a relatively
stable internal environment despite external changes.
A — Diffusion is the movement of molecules from high to low concentration, not the overall
maintenance of internal stability.
B — Osmosis is the movement of water across a membrane, not the general process of
maintaining stability.
D — Filtration is the movement of water and solutes due to hydrostatic pressure, not the
maintenance of internal stability.
, 2 Intracellular fluid accounts for approximately what proportion of body weight?
A 1/3 of body weight
B 2/3 of body weight
C 1/4 of body weight
D 1/2 of body weight
Why B is correct: Intracellular fluid comprises approximately 2/3 of total body water and is
mainly located within muscle cells.
A — 1/3 of body weight represents extracellular fluid, not intracellular fluid.
C — 1/4 of body weight is not the correct proportion for intracellular fluid.
D — 1/2 of body weight is not the correct proportion; intracellular fluid is 2/3 of total body
water.
3 Extracellular fluid (ECF) is found in which of the following locations?
A Inside muscle cells
B Blood vessels, skin tissues, and spinal cord
C Within bone marrow
D Inside the nucleus of cells
Why B is correct: Extracellular fluid is found outside of cells in blood vessels, skin tissues,
and the spinal cord.
A — Inside muscle cells is where intracellular fluid is located, not extracellular fluid.
C — Bone marrow is not a primary location for extracellular fluid.
D — The nucleus contains intracellular fluid, not extracellular fluid.
