WGU D236 PATHOPHYSIOLOGY OBJECTIVE ASSESSMENT NEWEST 2026 TEST BANK | MULTIPLE CHOICE QUESTIONS WITH VERIFIED ANSWERS AND RATIONALES LATEST UPDATE

WGU D236 PATHOPHYSIOLOGY OBJECTIVE
ASSESSMENT NEWEST 2026 TEST BANK | MULTIPLE-
CHOICE QUESTIONS WITH VERIFIED ANSWERS AND
RATIONALES LATEST UPDATE

1: FOUNDATIONAL CONCEPTS & HOMEOSTASIS

Question 1: A patient has edema due to malnutrition. Which pathophysiologic
mechanism best explains this finding?
A) Increased hydrostatic pressure from fluid overload
B) Decreased plasma oncotic pressure due to low albumin
C) Increased capillary permeability from inflammation
D) Lymphatic obstruction from protein deficiency
Answer: B) Decreased plasma oncotic pressure due to low albumin
Rationale: Malnutrition leads to low serum albumin, which reduces the colloidal
osmotic (oncotic) pressure that normally holds fluid within the vascular space.
Fluid shifts into the interstitial space, causing edema. Increased hydrostatic
pressure (A) is seen in heart failure; increased permeability (C) occurs in
inflammation; lymphatic obstruction (D) causes lymphedema but is not the
primary mechanism in malnutrition.


Question 2: A patient with hypotension triggers the renin-angiotensin-
aldosterone system (RAAS). Which sequence correctly describes the hormonal
cascade?
A) Angiotensin I → renin → angiotensin II → aldosterone
B) Renin → angiotensin I → angiotensin II → aldosterone
C) Aldosterone → renin → angiotensin I → angiotensin II
D) Angiotensin II → renin → angiotensin I → aldosterone
Answer: B) Renin → angiotensin I → angiotensin II → aldosterone
Rationale: Renin is released from the kidneys in response to low BP; it converts
angiotensinogen to angiotensin I. ACE converts angiotensin I to angiotensin II,
1|Page

,which stimulates aldosterone release. Options A, C, and D reverse or scramble the
correct order.


Question 3: A patient’s serum potassium level is 6.8 mEq/dL (normal 3.5–5.2).
Which cardiac complication is the greatest concern?
A) Bradycardia with first-degree AV block
B) Ventricular fibrillation and cardiac arrest
C) ST-segment elevation mimicking MI
D) Prominent U waves on ECG
Answer: B) Ventricular fibrillation and cardiac arrest
Rationale: Severe hyperkalemia disrupts cardiac myocyte repolarization, leading
to peaked T waves, widened QRS, and eventual ventricular fibrillation or asystole.
Bradycardia (A) is not typical; ST elevation (C) is seen in MI; U waves (D) are
characteristic of hypokalemia, not hyperkalemia.


Question 4: In response to an infection, which immune cells produce cytokines to
activate antibody production?
A) B cells
B) Neutrophils
C) T cells
D) Macrophages
Answer: C) T cells
Rationale: T helper cells release cytokines that activate B cells to differentiate into
plasma cells that produce antibodies. B cells (A) produce antibodies but are
activated by T cells; neutrophils (B) are phagocytes in innate immunity;
macrophages (D) present antigens but do not directly stimulate B cells via
cytokine signaling in the same way.


Question 5: A nurse is teaching about homeostasis. Which statement by a student
indicates a need for further teaching?

2|Page

,A) "Homeostasis keeps the internal environment stable despite external
changes."
B) "Homeostasis is maintained primarily by negative feedback loops."
C) "Homeostatic mechanisms can be disrupted by infection and electrolyte
imbalances."
D) "Homeostasis means all body parameters remain exactly constant at all times."
Answer: D) "Homeostasis means all body parameters remain exactly constant at
all times."
Rationale: Homeostasis is a dynamic equilibrium, not absolute constancy. Values
fluctuate within a normal range. Options A, B, and C are accurate statements
about homeostasis.


Question 6: Which fluid compartment contains approximately two-thirds of total
body water?
A) Intracellular fluid (ICF)
B) Extracellular fluid (ECF)
C) Plasma
D) Interstitial fluid
Answer: A) Intracellular fluid (ICF)
Rationale: ICF accounts for ~2/3 of total body water. ECF (B) accounts for ~1/3.
Plasma (C) and interstitial fluid (D) are subdivisions of ECF, each making up a
smaller percentage.


Question 7: A patient receives an intravenous infusion of 3% saline (hypertonic).
What effect will this have on red blood cells?
A) Swelling and possible lysis
B) No change in cell size
C) Shrinkage due to water leaving the cells
D) Increased metabolism without size change
Answer: C) Shrinkage due to water leaving the cells
Rationale: Hypertonic solutions have higher osmolality than plasma, drawing

3|Page

, water out of cells (including RBCs) into the vascular space, causing cells to shrink.
Hypotonic solutions (A) cause swelling; isotonic solutions (B) cause no change;
metabolism (D) is not directly affected.


Question 8: Which transport process requires energy (ATP) to move molecules
against a concentration gradient?
A) Diffusion
B) Osmosis
C) Facilitated diffusion
D) Active transport
Answer: D) Active transport
Rationale: Active transport moves molecules from low to high concentration
using ATP (e.g., sodium-potassium pump). Diffusion (A) and osmosis (B) are
passive; facilitated diffusion (C) uses a carrier but is passive.


Question 9: Which statement correctly distinguishes innate from adaptive
immunity?
A) Innate immunity is specific; adaptive immunity is non-specific.
B) Innate immunity has memory; adaptive immunity does not.
C) Innate immunity includes skin and stomach acid; adaptive immunity includes T
and B cells.
D) Innate immunity develops after exposure; adaptive immunity is present at
birth.
Answer: C) Innate immunity includes skin and stomach acid; adaptive immunity
includes T and B cells.
Rationale: Innate immunity is non-specific, present at birth, and lacks memory; it
includes physical/chemical barriers (skin, stomach acid). Adaptive immunity is
specific, develops after exposure, and has memory via T and B cells. Options A, B,
and D reverse the correct characteristics.




4|Page