1|Page - WGU D413-
1. A patient with a history of chronic alcoholism presents with confusion, ataxia, and
ophthalmoplegia. Which deficiency is most likely causing these symptoms?
A) Niacin (B3)
B) Cobalamin (B12)
C) Pyridoxine (B6)
D) Thiamine (B1)
Thiamine is a cofactor for carbohydrate metabolism; its deficiency leads to Wernicke-Korsakoff
syndrome, characterized by the classic triad of confusion, ataxia, and ophthalmoplegia.
2. A patient with a severe bacterial infection develops hypotension and tachycardia refractory to
fluid resuscitation. Which primary pathophysiological process is most likely occurring?
A) Decreased cardiac contractility
B) Massive capillary leak into the interstitium
C) Systemic vasodilation from inflammatory mediators
D) Adrenal insufficiency leading to cortisol depletion
Septic shock is characterized by massive systemic vasodilation due to nitric oxide and other
inflammatory mediators, leading to distributive shock that is often resistant to fluids.
3. A patient with chronic kidney disease has a serum phosphate level of 6.5 mg/dL. Which
electrolyte imbalance is most likely to be concurrent with this finding?
A) Hyperkalemia
B) Hypermagnesemia
C) Hypocalcemia
D) Hypernatremia
Hyperphosphatemia, common in CKD, leads to the precipitation of calcium phosphate in tissues,
causing a reciprocal drop in serum calcium levels.
4. A nurse is evaluating a patient's arterial blood gas: pH 7.28, PaCO2 55 mmHg, HCO3- 24 mEq/L.
How should this result be interpreted?
A) Metabolic acidosis with compensation
,2|Page - WGU D413-
B) Metabolic alkalosis with compensation
C) Respiratory alkalosis
D) Respiratory acidosis
The pH is low (acidosis) and the PaCO2 is elevated, indicating a respiratory component. The
HCO3- is normal, suggesting this is an acute, uncompensated respiratory acidosis.
5. A patient has a genetic mutation that results in the production of a non-functioning protein. This
type of mutation is best described as a:
A) Loss-of-function mutation
B) Gain-of-function mutation
C) Silent mutation
D) Frameshift mutation
A loss-of-function mutation results in a gene product with reduced or no function, often leading to
a recessive phenotype if the other allele is normal.
6. Which immunoglobulin is primarily responsible for the defense against parasitic infections and is
associated with allergic reactions?
A) IgA
B) IgE
C) IgG
D) IgM
IgE binds to mast cells and basophils and, upon antigen encounter, triggers the release of
histamine and other mediators involved in allergic and anti-parasitic responses.
7. A patient with heart failure is given a loop diuretic to reduce preload. What is the primary
mechanism of action for this drug class?
A) Blockade of aldosterone receptors
B) Inhibition of carbonic anhydrase
C) Inhibition of the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle
D) Blockade of sodium channels in the distal tubule
Loop diuretics are potent inhibitors of this specific transporter, leading to significant sodium and
water excretion and a rapid reduction in fluid volume.
8. The renin-angiotensin-aldosterone system (RAAS) is activated in response to which of the
following stimuli?
A) Increased serum sodium levels
,3|Page - WGU D413-
B) Increased blood volume
C) Decreased sympathetic nervous system activity
D) Decreased renal perfusion pressure
The juxtaglomerular cells in the kidney release renin in response to low blood pressure, low
sodium delivery, or sympathetic stimulation, initiating the RAAS cascade to increase blood
pressure.
9. A patient with a history of atrial fibrillation is at the highest risk for which type of stroke?
A) Embolic stroke
B) Thrombotic stroke
C) Lacunar stroke
D) Hemorrhagic stroke
Atrial fibrillation causes blood stasis in the atria, which can lead to the formation of a thrombus.
An embolus breaking off and traveling to the brain is the primary cause of ischemic stroke in
these patients.
10. A child diagnosed with cystic fibrosis experiences recurrent lung infections and pancreatic
insufficiency. The underlying pathophysiological defect is a mutation in the gene encoding for:
A) Alpha-1 antitrypsin
B) Cystic fibrosis transmembrane conductance regulator (CFTR)
C) Phenylalanine hydroxylase
D) Hexosaminidase A
The CFTR gene mutation leads to defective chloride transport across epithelial cells, resulting in
thick, viscous secretions in the lungs, pancreas, and other organs.
11. A patient is diagnosed with hyperthyroidism. Which of the following clinical manifestations
would the nurse expect to find?
A) Weight gain and bradycardia
B) Cold intolerance and constipation
C) Weight loss and tachycardia
D) Lethargy and dry skin
Hyperthyroidism increases the body's metabolic rate, leading to weight loss, heat intolerance,
and increased sympathetic activity, causing tachycardia and anxiety.
12. Which type of immunity is acquired through the administration of a vaccine?
A) Active natural immunity
, 4|Page - WGU D413-
B) Passive natural immunity
C) Passive artificial immunity
D) Active artificial immunity
Vaccines introduce an antigen to stimulate the body's own immune system to produce antibodies
and memory cells, providing long-lasting active immunity that is artificially acquired.
13. A patient's tumor is described as poorly differentiated. This characteristic is associated with which
of the following?
A) High grade and aggressive potential
B) Low grade and slow growth
C) Benign transformation
D) Encapsulation with clear margins
Poorly differentiated cells, or high-grade tumors, have lost their specialized structure and
function, resembling primitive, rapidly dividing cells. This is a key indicator of aggressive
behavior and poor prognosis.
14. A patient with asthma experiences bronchoconstriction and airway inflammation. Which cell type
is primarily responsible for the early-phase asthmatic response?
A) Eosinophils
B) Mast cells
C) Neutrophils
D) Macrophages
In the early phase, allergens cross-link IgE antibodies on mast cells, triggering degranulation
and the release of histamine, leukotrienes, and prostaglandins, which cause immediate
bronchoconstriction.
15. A patient has a serum sodium level of 125 mEq/L. Which clinical manifestation is the most
concerning and requires immediate intervention?
A) Dry mucous membranes
B) Orthostatic hypotension
C) Confusion and seizures
D) Muscle cramps
Hyponatremia causes water to shift into brain cells, leading to cerebral edema. This can rapidly
progress to confusion, seizures, coma, and death.
1. A patient with a history of chronic alcoholism presents with confusion, ataxia, and
ophthalmoplegia. Which deficiency is most likely causing these symptoms?
A) Niacin (B3)
B) Cobalamin (B12)
C) Pyridoxine (B6)
D) Thiamine (B1)
Thiamine is a cofactor for carbohydrate metabolism; its deficiency leads to Wernicke-Korsakoff
syndrome, characterized by the classic triad of confusion, ataxia, and ophthalmoplegia.
2. A patient with a severe bacterial infection develops hypotension and tachycardia refractory to
fluid resuscitation. Which primary pathophysiological process is most likely occurring?
A) Decreased cardiac contractility
B) Massive capillary leak into the interstitium
C) Systemic vasodilation from inflammatory mediators
D) Adrenal insufficiency leading to cortisol depletion
Septic shock is characterized by massive systemic vasodilation due to nitric oxide and other
inflammatory mediators, leading to distributive shock that is often resistant to fluids.
3. A patient with chronic kidney disease has a serum phosphate level of 6.5 mg/dL. Which
electrolyte imbalance is most likely to be concurrent with this finding?
A) Hyperkalemia
B) Hypermagnesemia
C) Hypocalcemia
D) Hypernatremia
Hyperphosphatemia, common in CKD, leads to the precipitation of calcium phosphate in tissues,
causing a reciprocal drop in serum calcium levels.
4. A nurse is evaluating a patient's arterial blood gas: pH 7.28, PaCO2 55 mmHg, HCO3- 24 mEq/L.
How should this result be interpreted?
A) Metabolic acidosis with compensation
,2|Page - WGU D413-
B) Metabolic alkalosis with compensation
C) Respiratory alkalosis
D) Respiratory acidosis
The pH is low (acidosis) and the PaCO2 is elevated, indicating a respiratory component. The
HCO3- is normal, suggesting this is an acute, uncompensated respiratory acidosis.
5. A patient has a genetic mutation that results in the production of a non-functioning protein. This
type of mutation is best described as a:
A) Loss-of-function mutation
B) Gain-of-function mutation
C) Silent mutation
D) Frameshift mutation
A loss-of-function mutation results in a gene product with reduced or no function, often leading to
a recessive phenotype if the other allele is normal.
6. Which immunoglobulin is primarily responsible for the defense against parasitic infections and is
associated with allergic reactions?
A) IgA
B) IgE
C) IgG
D) IgM
IgE binds to mast cells and basophils and, upon antigen encounter, triggers the release of
histamine and other mediators involved in allergic and anti-parasitic responses.
7. A patient with heart failure is given a loop diuretic to reduce preload. What is the primary
mechanism of action for this drug class?
A) Blockade of aldosterone receptors
B) Inhibition of carbonic anhydrase
C) Inhibition of the Na-K-2Cl cotransporter in the thick ascending limb of the loop of Henle
D) Blockade of sodium channels in the distal tubule
Loop diuretics are potent inhibitors of this specific transporter, leading to significant sodium and
water excretion and a rapid reduction in fluid volume.
8. The renin-angiotensin-aldosterone system (RAAS) is activated in response to which of the
following stimuli?
A) Increased serum sodium levels
,3|Page - WGU D413-
B) Increased blood volume
C) Decreased sympathetic nervous system activity
D) Decreased renal perfusion pressure
The juxtaglomerular cells in the kidney release renin in response to low blood pressure, low
sodium delivery, or sympathetic stimulation, initiating the RAAS cascade to increase blood
pressure.
9. A patient with a history of atrial fibrillation is at the highest risk for which type of stroke?
A) Embolic stroke
B) Thrombotic stroke
C) Lacunar stroke
D) Hemorrhagic stroke
Atrial fibrillation causes blood stasis in the atria, which can lead to the formation of a thrombus.
An embolus breaking off and traveling to the brain is the primary cause of ischemic stroke in
these patients.
10. A child diagnosed with cystic fibrosis experiences recurrent lung infections and pancreatic
insufficiency. The underlying pathophysiological defect is a mutation in the gene encoding for:
A) Alpha-1 antitrypsin
B) Cystic fibrosis transmembrane conductance regulator (CFTR)
C) Phenylalanine hydroxylase
D) Hexosaminidase A
The CFTR gene mutation leads to defective chloride transport across epithelial cells, resulting in
thick, viscous secretions in the lungs, pancreas, and other organs.
11. A patient is diagnosed with hyperthyroidism. Which of the following clinical manifestations
would the nurse expect to find?
A) Weight gain and bradycardia
B) Cold intolerance and constipation
C) Weight loss and tachycardia
D) Lethargy and dry skin
Hyperthyroidism increases the body's metabolic rate, leading to weight loss, heat intolerance,
and increased sympathetic activity, causing tachycardia and anxiety.
12. Which type of immunity is acquired through the administration of a vaccine?
A) Active natural immunity
, 4|Page - WGU D413-
B) Passive natural immunity
C) Passive artificial immunity
D) Active artificial immunity
Vaccines introduce an antigen to stimulate the body's own immune system to produce antibodies
and memory cells, providing long-lasting active immunity that is artificially acquired.
13. A patient's tumor is described as poorly differentiated. This characteristic is associated with which
of the following?
A) High grade and aggressive potential
B) Low grade and slow growth
C) Benign transformation
D) Encapsulation with clear margins
Poorly differentiated cells, or high-grade tumors, have lost their specialized structure and
function, resembling primitive, rapidly dividing cells. This is a key indicator of aggressive
behavior and poor prognosis.
14. A patient with asthma experiences bronchoconstriction and airway inflammation. Which cell type
is primarily responsible for the early-phase asthmatic response?
A) Eosinophils
B) Mast cells
C) Neutrophils
D) Macrophages
In the early phase, allergens cross-link IgE antibodies on mast cells, triggering degranulation
and the release of histamine, leukotrienes, and prostaglandins, which cause immediate
bronchoconstriction.
15. A patient has a serum sodium level of 125 mEq/L. Which clinical manifestation is the most
concerning and requires immediate intervention?
A) Dry mucous membranes
B) Orthostatic hypotension
C) Confusion and seizures
D) Muscle cramps
Hyponatremia causes water to shift into brain cells, leading to cerebral edema. This can rapidly
progress to confusion, seizures, coma, and death.
