NRS 455 Final Exam V3 | NRS 455
Pathophysiology | Actual Q&A with
Rationale (NRS455 Final Exam) | Grand
Canyon University
1. A patient presents with severe dehydration and hypotension. Which of the following
findings should the nurse expect to see as a compensatory mechanism?
A. Decrease in heart rate
B. Increase in urine output
C. Activation of the renin-angiotensin-aldosterone system (RAAS)
D. Vasodilation of peripheral blood vessels
Correct Answer: C
Rationale: The RAAS is activated in response to low blood pressure and reduced renal
perfusion to promote sodium and water retention. This mechanism aims to increase blood
volume and restore systemic arterial pressure. Conversely, the body would exhibit
tachycardia and vasoconstriction rather than bradycardia or vasodilation to maintain
cardiac output.
2. A nurse is reviewing the lab results of a patient with suspected Acute Kidney Injury (AKI).
Which of the following are considered prerenal causes of AKI? (Select All That Apply)
A. Hypovolemic shock
,B. Nephrotoxic medications (e.g., Gentamicin)
C. Congestive heart failure
D. Bilateral ureteral obstruction
E. Severe burns
F. Renal artery stenosis
Correct Answer: A, C, E, F
Rationale: Prerenal causes of AKI are related to decreased blood flow to the kidneys
without direct damage to the renal parenchyma. Conditions like shock, heart failure, burns,
and stenosis reduce perfusion and lead to ischemia. Nephrotoxic drugs cause intrarenal
damage, while obstructions are categorized as postrenal causes.
3. Which pathophysiological process is primarily responsible for the development of Type 1
Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Hypersecretion of glucagon by alpha cells
D. Excessive glucose production by the liver
Correct Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
resulting from the autoimmune-mediated destruction of beta cells in the Islets of
,Langerhans. This differs from Type 2 Diabetes, where the primary issues are insulin
resistance and relative insulin deficiency. Without beta cells, the body cannot produce the
insulin required to regulate blood glucose levels.
4. A patient is diagnosed with left-sided heart failure. Which clinical manifestation is a direct
result of increased pulmonary hydrostatic pressure?
A. Jugular venous distension
B. Peripheral edema
C. Crackles in the lung bases
D. Hepatomegaly
Correct Answer: C
Rationale: Left-sided heart failure leads to blood backing up into the pulmonary
circulation, which increases hydrostatic pressure in the pulmonary capillaries. This
pressure forces fluid into the alveoli, causing crackles or rales upon auscultation.
Symptoms like jugular venous distension and peripheral edema are classic signs of right-
sided heart failure.
5. Which of the following describes the pathophysiology of Chronic Obstructive Pulmonary
Disease (COPD) characterized by emphysema?
A. Hypersecretion of mucus and chronic productive cough
B. Permanent enlargement of gas-exchange airways and destruction of alveolar walls
C. Hyperresponsiveness of the airways to environmental allergens
, D. Acute inflammation of the bronchioles following a viral infection
Correct Answer: B
Rationale: Emphysema involves the destruction of alveolar septa and loss of elastic recoil,
leading to air trapping and hyperinflation of the lungs. This structural damage reduces the
surface area available for gas exchange. In contrast, chronic bronchitis is defined by mucus
hypersecretion and chronic cough, and asthma is defined by airway hyperresponsiveness.
6. A patient is admitted with a suspected Myocardial Infarction (MI). Which laboratory
marker is the most specific for cardiac muscle damage?
A. Troponin I
B. Myoglobin
C. Creatine Kinase (CK-MB)
D. Lactate Dehydrogenase (LDH)
Correct Answer: A
Rationale: Troponin I is highly specific to cardiac muscle and is the preferred biomarker
for diagnosing MI due to its high sensitivity. While CK-MB is also used, it can be found in
skeletal muscle, making it less specific than Troponins. Myoglobin rises early but lacks
specificity, and LDH is no longer commonly used for acute MI diagnosis.
7. A 65-year-old patient presents with a ‘pill-rolling’ tremor, bradykinesia, and muscle rigidity.
These symptoms are characteristic of a deficiency in which neurotransmitter?
A. Dopamine
Pathophysiology | Actual Q&A with
Rationale (NRS455 Final Exam) | Grand
Canyon University
1. A patient presents with severe dehydration and hypotension. Which of the following
findings should the nurse expect to see as a compensatory mechanism?
A. Decrease in heart rate
B. Increase in urine output
C. Activation of the renin-angiotensin-aldosterone system (RAAS)
D. Vasodilation of peripheral blood vessels
Correct Answer: C
Rationale: The RAAS is activated in response to low blood pressure and reduced renal
perfusion to promote sodium and water retention. This mechanism aims to increase blood
volume and restore systemic arterial pressure. Conversely, the body would exhibit
tachycardia and vasoconstriction rather than bradycardia or vasodilation to maintain
cardiac output.
2. A nurse is reviewing the lab results of a patient with suspected Acute Kidney Injury (AKI).
Which of the following are considered prerenal causes of AKI? (Select All That Apply)
A. Hypovolemic shock
,B. Nephrotoxic medications (e.g., Gentamicin)
C. Congestive heart failure
D. Bilateral ureteral obstruction
E. Severe burns
F. Renal artery stenosis
Correct Answer: A, C, E, F
Rationale: Prerenal causes of AKI are related to decreased blood flow to the kidneys
without direct damage to the renal parenchyma. Conditions like shock, heart failure, burns,
and stenosis reduce perfusion and lead to ischemia. Nephrotoxic drugs cause intrarenal
damage, while obstructions are categorized as postrenal causes.
3. Which pathophysiological process is primarily responsible for the development of Type 1
Diabetes Mellitus?
A. Autoimmune destruction of pancreatic beta cells
B. Insulin resistance in peripheral tissues
C. Hypersecretion of glucagon by alpha cells
D. Excessive glucose production by the liver
Correct Answer: A
Rationale: Type 1 Diabetes Mellitus is characterized by an absolute insulin deficiency
resulting from the autoimmune-mediated destruction of beta cells in the Islets of
,Langerhans. This differs from Type 2 Diabetes, where the primary issues are insulin
resistance and relative insulin deficiency. Without beta cells, the body cannot produce the
insulin required to regulate blood glucose levels.
4. A patient is diagnosed with left-sided heart failure. Which clinical manifestation is a direct
result of increased pulmonary hydrostatic pressure?
A. Jugular venous distension
B. Peripheral edema
C. Crackles in the lung bases
D. Hepatomegaly
Correct Answer: C
Rationale: Left-sided heart failure leads to blood backing up into the pulmonary
circulation, which increases hydrostatic pressure in the pulmonary capillaries. This
pressure forces fluid into the alveoli, causing crackles or rales upon auscultation.
Symptoms like jugular venous distension and peripheral edema are classic signs of right-
sided heart failure.
5. Which of the following describes the pathophysiology of Chronic Obstructive Pulmonary
Disease (COPD) characterized by emphysema?
A. Hypersecretion of mucus and chronic productive cough
B. Permanent enlargement of gas-exchange airways and destruction of alveolar walls
C. Hyperresponsiveness of the airways to environmental allergens
, D. Acute inflammation of the bronchioles following a viral infection
Correct Answer: B
Rationale: Emphysema involves the destruction of alveolar septa and loss of elastic recoil,
leading to air trapping and hyperinflation of the lungs. This structural damage reduces the
surface area available for gas exchange. In contrast, chronic bronchitis is defined by mucus
hypersecretion and chronic cough, and asthma is defined by airway hyperresponsiveness.
6. A patient is admitted with a suspected Myocardial Infarction (MI). Which laboratory
marker is the most specific for cardiac muscle damage?
A. Troponin I
B. Myoglobin
C. Creatine Kinase (CK-MB)
D. Lactate Dehydrogenase (LDH)
Correct Answer: A
Rationale: Troponin I is highly specific to cardiac muscle and is the preferred biomarker
for diagnosing MI due to its high sensitivity. While CK-MB is also used, it can be found in
skeletal muscle, making it less specific than Troponins. Myoglobin rises early but lacks
specificity, and LDH is no longer commonly used for acute MI diagnosis.
7. A 65-year-old patient presents with a ‘pill-rolling’ tremor, bradykinesia, and muscle rigidity.
These symptoms are characteristic of a deficiency in which neurotransmitter?
A. Dopamine
