NR 283 PATHOPHYSIOLOGY FINAL EXAM – QUESTIONS AND ANSWERS |
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Cellular Adaptation and Injury
Inflammation and Immunity
Fluid and Electrolyte Balance
Acid-Base Homeostasis
Genetics and Neoplasia
Alterations in Hematologic Function
Cardiovascular and Respiratory Pathophysiology
Renal and Gastrointestinal Pathophysiology
Endocrine and Neurologic Pathophysiology
Multisystem Disorders and Systemic Effects
Introduction
This comprehensive examination has been meticulously developed to assess your
mastery of fundamental pathophysiology concepts crucial for clinical practice. The
exam encompasses a broad spectrum of topics, from basic cellular mechanisms to
complex multisystem disorders. It is designed to evaluate your ability to apply
theoretical knowledge to patient scenarios, interpret clinical manifestations, and
formulate sound clinical judgments. The multiple-choice format, coupled with
detailed rationales, reinforces learning by explaining the 'why' behind each correct
answer. This assessment emphasizes the critical thinking and decision-making skills
essential for safe and effective patient care in diverse healthcare settings.
SECTION ONE: QUESTIONS 1-50
,1. A patient is diagnosed with metabolic acidosis. Which of the following
arterial blood gas (ABG) values would the healthcare provider expect to see?
A. pH 7.48, PaCO2 48, HCO3 32
B. pH 7.32, PaCO2 40, HCO3 18
C. pH 7.50, PaCO2 30, HCO3 22
D. pH 7.35, PaCO2 55, HCO3 29
🟢 Correct Answer: B. pH 7.32, PaCO2 40, HCO3 18
🔴 Explanation: Metabolic acidosis is characterized by a low pH (below 7.35) and
a low bicarbonate (HCO3) level (below 22 mEq/L) due to a primary loss of
bicarbonate or gain of acid. The PaCO2 may be normal or low as a compensatory
response. Option A indicates metabolic alkalosis. Option C indicates respiratory
alkalosis. Option D indicates respiratory acidosis with metabolic compensation.
2. A nurse is educating a patient with heart failure about the pathophysiology
of their condition. The nurse explains that the activation of the renin-
angiotensin-aldosterone system (RAAS) leads to which of the following?
A. Vasodilation and decreased preload
B. Sodium and water retention
C. Decreased systemic vascular resistance
D. Inhibition of antidiuretic hormone (ADH)
🟢 Correct Answer: B. Sodium and water retention
🔴 Explanation: The RAAS is activated in response to decreased renal perfusion,
leading to the production of angiotensin II, a potent vasoconstrictor, and the
release of aldosterone. Aldosterone promotes sodium and water reabsorption in
the kidneys, which increases blood volume and preload, exacerbating heart
failure. The other options describe effects opposite to the actions of a hyperactive
RAAS.
,3. A patient with severe liver disease presents with ascites and peripheral
edema. The most likely underlying pathophysiological mechanism for this fluid
accumulation is:
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased capillary permeability
D. Lymphatic obstruction
🟢 Correct Answer: B. Decreased plasma oncotic pressure
🔴 Explanation: The liver is the primary site for albumin synthesis. In severe liver
disease, decreased albumin production leads to hypoalbuminemia. A low plasma
albumin concentration reduces plasma oncotic (colloid osmotic) pressure, which
is the force that pulls fluid into the capillaries. This imbalance results in fluid
shifting from the vascular space into the interstitial space, causing ascites and
edema.
4. Which of the following best describes the process of metaplasia?
A. An increase in the size of individual cells leading to tissue enlargement
B. A reversible change in which one adult cell type is replaced by another adult
cell type
C. A disorganized growth of cells with a loss of normal tissue architecture
D. An abnormal proliferation of cells that can invade surrounding tissues
🟢 Correct Answer: B. A reversible change in which one adult cell type is replaced
by another adult cell type
🔴 Explanation: Metaplasia is an adaptive cellular change where a differentiated
cell type is replaced by another differentiated cell type of the same germline in
response to chronic irritation or inflammation. It is considered reversible if the
, irritant is removed. Option A describes hypertrophy, Option C describes dysplasia,
and Option D describes neoplasia/malignancy.
5. A patient is experiencing nausea, vomiting, and diarrhea. Which of the
following acid-base imbalances is this patient most at risk for?
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Respiratory alkalosis
🟢 Correct Answer: A. Metabolic acidosis
🔴 Explanation: Diarrhea causes a loss of bicarbonate-rich intestinal fluid, leading
to a direct loss of base and the development of metabolic acidosis. While
vomiting often causes metabolic alkalosis due to the loss of hydrochloric acid,
diarrhea is a significant cause of metabolic acidosis because of the loss of
bicarbonate.
6. The pathophysiological hallmark of type 1 diabetes mellitus is:
A. Resistance of target tissues to insulin
B. An absolute deficiency of insulin due to autoimmune destruction of pancreatic
beta cells
C. A relative deficiency of insulin due to impaired insulin secretion and insulin
resistance
D. Overproduction of glucose by the liver
🟢 Correct Answer: B. An absolute deficiency of insulin due to autoimmune
destruction of pancreatic beta cells
🔴 Explanation: Type 1 diabetes mellitus is characterized by an absolute lack of
insulin resulting from the autoimmune destruction of the insulin-producing beta
cells in the islets of Langerhans of the pancreas. Options A and C describe type 2
VERIFIED AND WELL DETAILED ANSWERS | PLUS RATIONALES | DOWNLOAD
AND PASS | LATEST EXAM UPDATE 2026/2027
Core Domains
Cellular Adaptation and Injury
Inflammation and Immunity
Fluid and Electrolyte Balance
Acid-Base Homeostasis
Genetics and Neoplasia
Alterations in Hematologic Function
Cardiovascular and Respiratory Pathophysiology
Renal and Gastrointestinal Pathophysiology
Endocrine and Neurologic Pathophysiology
Multisystem Disorders and Systemic Effects
Introduction
This comprehensive examination has been meticulously developed to assess your
mastery of fundamental pathophysiology concepts crucial for clinical practice. The
exam encompasses a broad spectrum of topics, from basic cellular mechanisms to
complex multisystem disorders. It is designed to evaluate your ability to apply
theoretical knowledge to patient scenarios, interpret clinical manifestations, and
formulate sound clinical judgments. The multiple-choice format, coupled with
detailed rationales, reinforces learning by explaining the 'why' behind each correct
answer. This assessment emphasizes the critical thinking and decision-making skills
essential for safe and effective patient care in diverse healthcare settings.
SECTION ONE: QUESTIONS 1-50
,1. A patient is diagnosed with metabolic acidosis. Which of the following
arterial blood gas (ABG) values would the healthcare provider expect to see?
A. pH 7.48, PaCO2 48, HCO3 32
B. pH 7.32, PaCO2 40, HCO3 18
C. pH 7.50, PaCO2 30, HCO3 22
D. pH 7.35, PaCO2 55, HCO3 29
🟢 Correct Answer: B. pH 7.32, PaCO2 40, HCO3 18
🔴 Explanation: Metabolic acidosis is characterized by a low pH (below 7.35) and
a low bicarbonate (HCO3) level (below 22 mEq/L) due to a primary loss of
bicarbonate or gain of acid. The PaCO2 may be normal or low as a compensatory
response. Option A indicates metabolic alkalosis. Option C indicates respiratory
alkalosis. Option D indicates respiratory acidosis with metabolic compensation.
2. A nurse is educating a patient with heart failure about the pathophysiology
of their condition. The nurse explains that the activation of the renin-
angiotensin-aldosterone system (RAAS) leads to which of the following?
A. Vasodilation and decreased preload
B. Sodium and water retention
C. Decreased systemic vascular resistance
D. Inhibition of antidiuretic hormone (ADH)
🟢 Correct Answer: B. Sodium and water retention
🔴 Explanation: The RAAS is activated in response to decreased renal perfusion,
leading to the production of angiotensin II, a potent vasoconstrictor, and the
release of aldosterone. Aldosterone promotes sodium and water reabsorption in
the kidneys, which increases blood volume and preload, exacerbating heart
failure. The other options describe effects opposite to the actions of a hyperactive
RAAS.
,3. A patient with severe liver disease presents with ascites and peripheral
edema. The most likely underlying pathophysiological mechanism for this fluid
accumulation is:
A. Increased capillary hydrostatic pressure
B. Decreased plasma oncotic pressure
C. Increased capillary permeability
D. Lymphatic obstruction
🟢 Correct Answer: B. Decreased plasma oncotic pressure
🔴 Explanation: The liver is the primary site for albumin synthesis. In severe liver
disease, decreased albumin production leads to hypoalbuminemia. A low plasma
albumin concentration reduces plasma oncotic (colloid osmotic) pressure, which
is the force that pulls fluid into the capillaries. This imbalance results in fluid
shifting from the vascular space into the interstitial space, causing ascites and
edema.
4. Which of the following best describes the process of metaplasia?
A. An increase in the size of individual cells leading to tissue enlargement
B. A reversible change in which one adult cell type is replaced by another adult
cell type
C. A disorganized growth of cells with a loss of normal tissue architecture
D. An abnormal proliferation of cells that can invade surrounding tissues
🟢 Correct Answer: B. A reversible change in which one adult cell type is replaced
by another adult cell type
🔴 Explanation: Metaplasia is an adaptive cellular change where a differentiated
cell type is replaced by another differentiated cell type of the same germline in
response to chronic irritation or inflammation. It is considered reversible if the
, irritant is removed. Option A describes hypertrophy, Option C describes dysplasia,
and Option D describes neoplasia/malignancy.
5. A patient is experiencing nausea, vomiting, and diarrhea. Which of the
following acid-base imbalances is this patient most at risk for?
A. Metabolic acidosis
B. Metabolic alkalosis
C. Respiratory acidosis
D. Respiratory alkalosis
🟢 Correct Answer: A. Metabolic acidosis
🔴 Explanation: Diarrhea causes a loss of bicarbonate-rich intestinal fluid, leading
to a direct loss of base and the development of metabolic acidosis. While
vomiting often causes metabolic alkalosis due to the loss of hydrochloric acid,
diarrhea is a significant cause of metabolic acidosis because of the loss of
bicarbonate.
6. The pathophysiological hallmark of type 1 diabetes mellitus is:
A. Resistance of target tissues to insulin
B. An absolute deficiency of insulin due to autoimmune destruction of pancreatic
beta cells
C. A relative deficiency of insulin due to impaired insulin secretion and insulin
resistance
D. Overproduction of glucose by the liver
🟢 Correct Answer: B. An absolute deficiency of insulin due to autoimmune
destruction of pancreatic beta cells
🔴 Explanation: Type 1 diabetes mellitus is characterized by an absolute lack of
insulin resulting from the autoimmune destruction of the insulin-producing beta
cells in the islets of Langerhans of the pancreas. Options A and C describe type 2
