HESI Pathophysiology Examination
100 Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
1. A client with left-sided heart failure is experiencing dyspnea and crackles.
Which pathophysiologic process best explains these findings?
A. Decreased pulmonary blood flow
B. Increased pulmonary venous pressure
C. Increased systemic vascular resistance only
D. Decreased left ventricular preload
Answer: Increased pulmonary venous pressure
Rationale: Left-sided heart failure causes blood to back up into the pulmonary
circulation, increasing pulmonary venous and capillary pressure. This
promotes fluid movement into the lung interstitium and alveoli, producing
pulmonary edema, crackles, and dyspnea.
2. Which cellular adaptation occurs when a skeletal muscle is subjected to
increased workload?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: Hypertrophy
Rationale: Hypertrophy is an increase in cell size caused by increased
workload. Skeletal muscle fibers enlarge when repeatedly exposed to
increased demand.
, 3. A client with severe vomiting develops metabolic alkalosis. Which
mechanism contributes most directly to this acid-base disturbance?
A. Excessive bicarbonate loss
B. Retention of hydrogen ions
C. Loss of gastric hydrochloric acid
D. Increased lactic acid production
Answer: Loss of gastric hydrochloric acid
Rationale: Repeated vomiting causes loss of hydrochloric acid from the
stomach. The resulting decrease in hydrogen ions raises blood pH and
contributes to metabolic alkalosis.
4. Which finding is most characteristic of inflammation?
A. Decreased vascular permeability
B. Vasoconstriction lasting several hours
C. Increased blood flow and capillary permeability
D. Suppression of leukocyte activity
Answer: Increased blood flow and capillary permeability
Rationale: Acute inflammation causes vasodilation and increased vascular
permeability. These changes allow plasma proteins and leukocytes to leave
the bloodstream and enter injured tissue.
5. A client with chronic obstructive pulmonary disease develops respiratory
acidosis. Which finding would the nurse expect?
A. Decreased PaCO₂
B. Increased PaCO₂
C. Increased blood pH
D. Decreased bicarbonate from renal compensation
Answer: Increased PaCO₂
Rationale: COPD can impair ventilation and carbon dioxide elimination.
Retention of CO₂ increases carbonic acid concentration and produces
respiratory acidosis.
6. Which hormone primarily lowers blood glucose levels?
,A. Glucagon
B. Cortisol
C. Insulin
D. Epinephrine
Answer: Insulin
Rationale: Insulin promotes glucose uptake by cells and storage of glucose as
glycogen, thereby lowering blood glucose concentration.
7. A client with type 1 diabetes mellitus has hyperglycemia and ketonuria.
Which process is responsible for the ketone production?
A. Increased insulin activity
B. Increased fat breakdown
C. Increased glycogen storage
D. Decreased glucagon activity
Answer: Increased fat breakdown
Rationale: In the absence of adequate insulin, cells cannot effectively use
glucose. The body increases lipolysis, producing fatty acids that are converted
into ketone bodies, potentially causing diabetic ketoacidosis.
8. Which type of hypersensitivity reaction is associated with anaphylaxis?
A. Type I
B. Type II
C. Type III
D. Type IV
Answer: Type I
Rationale: Type I hypersensitivity is an immediate, IgE-mediated reaction. It
can cause systemic anaphylaxis, bronchoconstriction, vasodilation, and
increased vascular permeability.
9. Which electrolyte abnormality is most strongly associated with
dangerous cardiac dysrhythmias?
A. Mild hypochloremia
B. Hyperkalemia
, C. Mild hypernatremia
D. Hypophosphatemia
Answer: Hyperkalemia
Rationale: Potassium is critical to cardiac electrical activity. Significant
hyperkalemia can alter myocardial conduction and cause life-threatening
dysrhythmias or cardiac arrest.
10.A client with nephrotic syndrome develops generalized edema. Which
pathophysiologic mechanism is primarily responsible?
A. Increased plasma oncotic pressure
B. Loss of plasma proteins in the urine
C. Increased red blood cell production
D. Increased serum albumin
Answer: Loss of plasma proteins in the urine
Rationale: Nephrotic syndrome causes increased glomerular permeability and
significant proteinuria. Loss of albumin lowers plasma oncotic pressure,
promoting movement of fluid into the tissues and causing edema.
11.Which organ is primarily responsible for producing erythropoietin in
response to hypoxia?
A. Liver
B. Spleen
C. Kidney
D. Pancreas
Answer: Kidney
Rationale: The kidneys produce erythropoietin when oxygen delivery is
inadequate. Erythropoietin stimulates the bone marrow to increase red blood
cell production.
12.A client with iron-deficiency anemia is fatigued because of which primary
mechanism?
A. Increased oxygen-carrying capacity
B. Decreased oxygen delivery to tissues
100 Questions And Correct Answers
(Verified Answers) Plus Rationales
2026 Q&A Instant Download Pdf
1. A client with left-sided heart failure is experiencing dyspnea and crackles.
Which pathophysiologic process best explains these findings?
A. Decreased pulmonary blood flow
B. Increased pulmonary venous pressure
C. Increased systemic vascular resistance only
D. Decreased left ventricular preload
Answer: Increased pulmonary venous pressure
Rationale: Left-sided heart failure causes blood to back up into the pulmonary
circulation, increasing pulmonary venous and capillary pressure. This
promotes fluid movement into the lung interstitium and alveoli, producing
pulmonary edema, crackles, and dyspnea.
2. Which cellular adaptation occurs when a skeletal muscle is subjected to
increased workload?
A. Atrophy
B. Metaplasia
C. Hypertrophy
D. Dysplasia
Answer: Hypertrophy
Rationale: Hypertrophy is an increase in cell size caused by increased
workload. Skeletal muscle fibers enlarge when repeatedly exposed to
increased demand.
, 3. A client with severe vomiting develops metabolic alkalosis. Which
mechanism contributes most directly to this acid-base disturbance?
A. Excessive bicarbonate loss
B. Retention of hydrogen ions
C. Loss of gastric hydrochloric acid
D. Increased lactic acid production
Answer: Loss of gastric hydrochloric acid
Rationale: Repeated vomiting causes loss of hydrochloric acid from the
stomach. The resulting decrease in hydrogen ions raises blood pH and
contributes to metabolic alkalosis.
4. Which finding is most characteristic of inflammation?
A. Decreased vascular permeability
B. Vasoconstriction lasting several hours
C. Increased blood flow and capillary permeability
D. Suppression of leukocyte activity
Answer: Increased blood flow and capillary permeability
Rationale: Acute inflammation causes vasodilation and increased vascular
permeability. These changes allow plasma proteins and leukocytes to leave
the bloodstream and enter injured tissue.
5. A client with chronic obstructive pulmonary disease develops respiratory
acidosis. Which finding would the nurse expect?
A. Decreased PaCO₂
B. Increased PaCO₂
C. Increased blood pH
D. Decreased bicarbonate from renal compensation
Answer: Increased PaCO₂
Rationale: COPD can impair ventilation and carbon dioxide elimination.
Retention of CO₂ increases carbonic acid concentration and produces
respiratory acidosis.
6. Which hormone primarily lowers blood glucose levels?
,A. Glucagon
B. Cortisol
C. Insulin
D. Epinephrine
Answer: Insulin
Rationale: Insulin promotes glucose uptake by cells and storage of glucose as
glycogen, thereby lowering blood glucose concentration.
7. A client with type 1 diabetes mellitus has hyperglycemia and ketonuria.
Which process is responsible for the ketone production?
A. Increased insulin activity
B. Increased fat breakdown
C. Increased glycogen storage
D. Decreased glucagon activity
Answer: Increased fat breakdown
Rationale: In the absence of adequate insulin, cells cannot effectively use
glucose. The body increases lipolysis, producing fatty acids that are converted
into ketone bodies, potentially causing diabetic ketoacidosis.
8. Which type of hypersensitivity reaction is associated with anaphylaxis?
A. Type I
B. Type II
C. Type III
D. Type IV
Answer: Type I
Rationale: Type I hypersensitivity is an immediate, IgE-mediated reaction. It
can cause systemic anaphylaxis, bronchoconstriction, vasodilation, and
increased vascular permeability.
9. Which electrolyte abnormality is most strongly associated with
dangerous cardiac dysrhythmias?
A. Mild hypochloremia
B. Hyperkalemia
, C. Mild hypernatremia
D. Hypophosphatemia
Answer: Hyperkalemia
Rationale: Potassium is critical to cardiac electrical activity. Significant
hyperkalemia can alter myocardial conduction and cause life-threatening
dysrhythmias or cardiac arrest.
10.A client with nephrotic syndrome develops generalized edema. Which
pathophysiologic mechanism is primarily responsible?
A. Increased plasma oncotic pressure
B. Loss of plasma proteins in the urine
C. Increased red blood cell production
D. Increased serum albumin
Answer: Loss of plasma proteins in the urine
Rationale: Nephrotic syndrome causes increased glomerular permeability and
significant proteinuria. Loss of albumin lowers plasma oncotic pressure,
promoting movement of fluid into the tissues and causing edema.
11.Which organ is primarily responsible for producing erythropoietin in
response to hypoxia?
A. Liver
B. Spleen
C. Kidney
D. Pancreas
Answer: Kidney
Rationale: The kidneys produce erythropoietin when oxygen delivery is
inadequate. Erythropoietin stimulates the bone marrow to increase red blood
cell production.
12.A client with iron-deficiency anemia is fatigued because of which primary
mechanism?
A. Increased oxygen-carrying capacity
B. Decreased oxygen delivery to tissues
