NUR 555 QUIZ 6 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE
SOLUTIONS/NEWEST UPDATE
Question 1
A patient is diagnosed with an empyema. What is the most accurate information the healthcare
professional provides to the patient regarding this condition?
A) It is a collection of air in the pleural space that requires a needle aspiration.
B) It is a viral infection of the lung parenchyma that will resolve with rest.
C) It is the presence of pus in the pleural space, usually requiring drainage via a chest tube.
D) It involves the formation of blebs on the lung surface that may rupture during exercise.
E) It is a chronic condition characterized by the permanent dilation of the bronchi.
Correct Answer: C) It is the presence of pus in the pleural space, usually requiring drainage
via a chest tube.
Rationale: Empyema is an accumulation of infected fluid (pus) in the pleural space, most
commonly as a complication of pneumonia. Because the fluid is infected and often
loculated, treatment requires both systemic antibiotics and physical drainage, typically
through a thoracostomy (chest tube).
Question 2
Which immunoglobulin (Ig) is primarily involved in the pathophysiology of childhood extrinsic
asthma?
A) IgG
B) IgM
C) IgA
D) IgE
E) IgD
Correct Answer: D) IgE
Rationale: Extrinsic (atopic) asthma is a Type I hypersensitivity reaction. Exposure to an
allergen triggers B cells to produce IgE antibodies, which bind to mast cells. Upon re-
exposure, the allergen cross-links the IgE, causing mast cell degranulation and the release
of inflammatory mediators like histamine.
Question 3
A 68-year-old patient presents with sudden-onset left-sided hemiparesis and facial droop that
began 45 minutes ago. A non-contrast CT scan of the head is negative for hemorrhage. What is
the most likely pathophysiological mechanism?
A) Rupture of a berry aneurysm in the Circle of Willis.
B) Thrombotic or embolic occlusion of a cerebral artery.
C) Demyelination of the corticospinal tract.
D) Compression of the brainstem by an infratentorial tumor.
E) Global hypoperfusion due to low cardiac output.
Correct Answer: B) Thrombotic or embolic occlusion of a cerebral artery.
, 2
Rationale: The sudden onset of focal neurological deficits in the absence of hemorrhage on
CT strongly suggests an ischemic stroke. This is usually caused by a thrombus forming over
an atherosclerotic plaque or an embolus (often from the heart) blocking blood flow to a
specific brain region.
Question 4
In the context of an acute ischemic stroke, what does the term "ischemic penumbra" refer to?
A) The area of the brain that has already undergone irreversible liquefactive necrosis.
B) The healthy brain tissue on the contralateral hemisphere.
C) The zone of hypoperfused but still viable tissue surrounding the central core of infarction.
D) The region where blood-brain barrier breakdown causes vasogenic edema.
E) The scar tissue formed by astrocytes following an injury.
Correct Answer: C) The zone of hypoperfused but still viable tissue surrounding the central
core of infarction.
Rationale: The penumbra is the "at-risk" tissue that receives enough collateral blood flow
to remain alive but not enough to function normally. Reperfusion therapies (like tPA or
thrombectomy) aim to save this tissue before it progresses to permanent infarction.
Question 5
What is the underlying physiologic basis for the "aura" experienced by some patients with
migraine headaches?
A) Rapid vasodilation of the meningeal arteries.
B) Increased intracranial pressure causing optic nerve compression.
C) Cortical spreading depression.
D) Activation of the trigeminal nerve by inflammatory cytokines.
E) Sudden release of serotonin from the pineal gland.
Correct Answer: C) Cortical spreading depression.
Rationale: Cortical spreading depression (CSD) is a wave of self-propagating neuronal and
glial depolarization that moves across the cerebral cortex. This electrical event is believed
to trigger the visual or sensory symptoms known as the aura and subsequently activate
trigeminal pain pathways.
Question 6
A patient with Multiple Sclerosis (MS) presents with optic neuritis. Which process is responsible
for the vision loss in this patient?
A) Bacterial infection of the vitreous humor.
B) Autoimmune-mediated demyelination of the optic nerve.
C) Increased intraocular pressure leading to retinal ischemia.
D) Accumulation of beta-amyloid plaques in the occipital lobe.
E) Ischemic stroke of the ophthalmic artery.
Correct Answer: B) Autoimmune-mediated demyelination of the optic nerve.
, 3
Rationale: MS is a chronic autoimmune disease characterized by the T-cell mediated
destruction of myelin in the Central Nervous System (CNS). Optic neuritis is often an early
sign, as the demyelination slows or blocks nerve impulses from the eye to the brain.
Question 7
During a cellular injury such as a myocardial infarction, why is the mitochondria particularly
susceptible to damage?
A) It lacks a protective membrane.
B) It has a high concentration of sodium that causes it to explode.
C) It is the site where ATP is depleted and calcium accumulates, leading to pore opening and cell
death.
D) It is the only organelle that produces free radicals.
E) It is responsible for the synthesis of misfolded proteins.
Correct Answer: C) It is the site where ATP is depleted and calcium accumulates, leading to
pore opening and cell death.
Rationale: Ischemia prevents oxidative phosphorylation, leading to ATP depletion. This
causes ion pump failure and an influx of calcium into the mitochondria. High calcium
levels trigger the opening of the mitochondrial permeability transition pore, which
irreversibly commits the cell to apoptosis or necrosis.
Question 8
When blood flow is restored to an area of ischemic tissue, the tissue can sometimes suffer further
injury. What is this phenomenon called?
A) Autophagy
B) Reperfusion injury
C) Hyperplasia
D) Coagulative necrosis
E) Metaplasia
Correct Answer: B) Reperfusion injury
Rationale: Reperfusion injury occurs when the return of oxygen to damaged cells leads to
the massive production of reactive oxygen species (free radicals), further damaging cellular
membranes and triggering a systemic inflammatory response.
Question 9
What is the most common cause of viral croup in children?
A) Haemophilus influenzae type b
B) Respiratory Syncytial Virus (RSV)
C) Parainfluenza virus
D) Streptococcus pneumoniae
E) Staphylococcus aureus
Correct Answer: C) Parainfluenza virus
, 4
Rationale: Croup (laryngotracheobronchitis) is most frequently caused by the parainfluenza
virus. It is characterized by subglottic edema, which leads to the classic "barking" cough
and inspiratory stridor.
Question 10
In a patient with chronic obstructive pulmonary disease (COPD), what is the primary cause of
pulmonary hypertension?
A) Chronic left heart failure leading to backup in the lungs.
B) Systemic hypotension causing compensatory vasoconstriction.
C) Chronic alveolar hypoxia leading to pulmonary artery vasoconstriction and remodeling.
D) Excessive production of surfactant by Type II pneumocytes.
E) Accumulation of fluid in the pleural space.
Correct Answer: C) Chronic alveolar hypoxia leading to pulmonary artery vasoconstriction
and remodeling.
Rationale: In COPD, areas of the lung are poorly ventilated. The body responds to this
hypoxia by constricting pulmonary arterioles (hypoxic pulmonary vasoconstriction) to
divert blood to better-ventilated areas. Over time, this chronic constriction leads to
permanent structural thickening of the vessel walls and hypertension.
Question 11
Which type of lung cancer is most strongly associated with a history of smoking and typically
arises near the hila, projecting into the bronchi?
A) Adenocarcinoma
B) Large cell carcinoma
C) Squamous cell carcinoma
D) Mesothelioma
E) Bronchial carcinoid tumor
Correct Answer: C) Squamous cell carcinoma
Rationale: Squamous cell carcinoma is highly correlated with smoking. It tends to be
located centrally near the large bronchi, often presenting with symptoms of airway
obstruction or hemoptysis.
Question 12
A patient with tuberculosis (TB) has "tubercles" visible on a chest X-ray. What do these
structures represent?
A) Areas of active bacterial replication and spread.
B) Fluid-filled cysts within the alveoli.
C) Granulomas consisting of a central area of necrosis surrounded by macrophages and
lymphocytes.
D) Malignant tumors triggered by the mycobacterium.
E) Scars from a previous viral pneumonia.
SOLUTIONS/NEWEST UPDATE
Question 1
A patient is diagnosed with an empyema. What is the most accurate information the healthcare
professional provides to the patient regarding this condition?
A) It is a collection of air in the pleural space that requires a needle aspiration.
B) It is a viral infection of the lung parenchyma that will resolve with rest.
C) It is the presence of pus in the pleural space, usually requiring drainage via a chest tube.
D) It involves the formation of blebs on the lung surface that may rupture during exercise.
E) It is a chronic condition characterized by the permanent dilation of the bronchi.
Correct Answer: C) It is the presence of pus in the pleural space, usually requiring drainage
via a chest tube.
Rationale: Empyema is an accumulation of infected fluid (pus) in the pleural space, most
commonly as a complication of pneumonia. Because the fluid is infected and often
loculated, treatment requires both systemic antibiotics and physical drainage, typically
through a thoracostomy (chest tube).
Question 2
Which immunoglobulin (Ig) is primarily involved in the pathophysiology of childhood extrinsic
asthma?
A) IgG
B) IgM
C) IgA
D) IgE
E) IgD
Correct Answer: D) IgE
Rationale: Extrinsic (atopic) asthma is a Type I hypersensitivity reaction. Exposure to an
allergen triggers B cells to produce IgE antibodies, which bind to mast cells. Upon re-
exposure, the allergen cross-links the IgE, causing mast cell degranulation and the release
of inflammatory mediators like histamine.
Question 3
A 68-year-old patient presents with sudden-onset left-sided hemiparesis and facial droop that
began 45 minutes ago. A non-contrast CT scan of the head is negative for hemorrhage. What is
the most likely pathophysiological mechanism?
A) Rupture of a berry aneurysm in the Circle of Willis.
B) Thrombotic or embolic occlusion of a cerebral artery.
C) Demyelination of the corticospinal tract.
D) Compression of the brainstem by an infratentorial tumor.
E) Global hypoperfusion due to low cardiac output.
Correct Answer: B) Thrombotic or embolic occlusion of a cerebral artery.
, 2
Rationale: The sudden onset of focal neurological deficits in the absence of hemorrhage on
CT strongly suggests an ischemic stroke. This is usually caused by a thrombus forming over
an atherosclerotic plaque or an embolus (often from the heart) blocking blood flow to a
specific brain region.
Question 4
In the context of an acute ischemic stroke, what does the term "ischemic penumbra" refer to?
A) The area of the brain that has already undergone irreversible liquefactive necrosis.
B) The healthy brain tissue on the contralateral hemisphere.
C) The zone of hypoperfused but still viable tissue surrounding the central core of infarction.
D) The region where blood-brain barrier breakdown causes vasogenic edema.
E) The scar tissue formed by astrocytes following an injury.
Correct Answer: C) The zone of hypoperfused but still viable tissue surrounding the central
core of infarction.
Rationale: The penumbra is the "at-risk" tissue that receives enough collateral blood flow
to remain alive but not enough to function normally. Reperfusion therapies (like tPA or
thrombectomy) aim to save this tissue before it progresses to permanent infarction.
Question 5
What is the underlying physiologic basis for the "aura" experienced by some patients with
migraine headaches?
A) Rapid vasodilation of the meningeal arteries.
B) Increased intracranial pressure causing optic nerve compression.
C) Cortical spreading depression.
D) Activation of the trigeminal nerve by inflammatory cytokines.
E) Sudden release of serotonin from the pineal gland.
Correct Answer: C) Cortical spreading depression.
Rationale: Cortical spreading depression (CSD) is a wave of self-propagating neuronal and
glial depolarization that moves across the cerebral cortex. This electrical event is believed
to trigger the visual or sensory symptoms known as the aura and subsequently activate
trigeminal pain pathways.
Question 6
A patient with Multiple Sclerosis (MS) presents with optic neuritis. Which process is responsible
for the vision loss in this patient?
A) Bacterial infection of the vitreous humor.
B) Autoimmune-mediated demyelination of the optic nerve.
C) Increased intraocular pressure leading to retinal ischemia.
D) Accumulation of beta-amyloid plaques in the occipital lobe.
E) Ischemic stroke of the ophthalmic artery.
Correct Answer: B) Autoimmune-mediated demyelination of the optic nerve.
, 3
Rationale: MS is a chronic autoimmune disease characterized by the T-cell mediated
destruction of myelin in the Central Nervous System (CNS). Optic neuritis is often an early
sign, as the demyelination slows or blocks nerve impulses from the eye to the brain.
Question 7
During a cellular injury such as a myocardial infarction, why is the mitochondria particularly
susceptible to damage?
A) It lacks a protective membrane.
B) It has a high concentration of sodium that causes it to explode.
C) It is the site where ATP is depleted and calcium accumulates, leading to pore opening and cell
death.
D) It is the only organelle that produces free radicals.
E) It is responsible for the synthesis of misfolded proteins.
Correct Answer: C) It is the site where ATP is depleted and calcium accumulates, leading to
pore opening and cell death.
Rationale: Ischemia prevents oxidative phosphorylation, leading to ATP depletion. This
causes ion pump failure and an influx of calcium into the mitochondria. High calcium
levels trigger the opening of the mitochondrial permeability transition pore, which
irreversibly commits the cell to apoptosis or necrosis.
Question 8
When blood flow is restored to an area of ischemic tissue, the tissue can sometimes suffer further
injury. What is this phenomenon called?
A) Autophagy
B) Reperfusion injury
C) Hyperplasia
D) Coagulative necrosis
E) Metaplasia
Correct Answer: B) Reperfusion injury
Rationale: Reperfusion injury occurs when the return of oxygen to damaged cells leads to
the massive production of reactive oxygen species (free radicals), further damaging cellular
membranes and triggering a systemic inflammatory response.
Question 9
What is the most common cause of viral croup in children?
A) Haemophilus influenzae type b
B) Respiratory Syncytial Virus (RSV)
C) Parainfluenza virus
D) Streptococcus pneumoniae
E) Staphylococcus aureus
Correct Answer: C) Parainfluenza virus
, 4
Rationale: Croup (laryngotracheobronchitis) is most frequently caused by the parainfluenza
virus. It is characterized by subglottic edema, which leads to the classic "barking" cough
and inspiratory stridor.
Question 10
In a patient with chronic obstructive pulmonary disease (COPD), what is the primary cause of
pulmonary hypertension?
A) Chronic left heart failure leading to backup in the lungs.
B) Systemic hypotension causing compensatory vasoconstriction.
C) Chronic alveolar hypoxia leading to pulmonary artery vasoconstriction and remodeling.
D) Excessive production of surfactant by Type II pneumocytes.
E) Accumulation of fluid in the pleural space.
Correct Answer: C) Chronic alveolar hypoxia leading to pulmonary artery vasoconstriction
and remodeling.
Rationale: In COPD, areas of the lung are poorly ventilated. The body responds to this
hypoxia by constricting pulmonary arterioles (hypoxic pulmonary vasoconstriction) to
divert blood to better-ventilated areas. Over time, this chronic constriction leads to
permanent structural thickening of the vessel walls and hypertension.
Question 11
Which type of lung cancer is most strongly associated with a history of smoking and typically
arises near the hila, projecting into the bronchi?
A) Adenocarcinoma
B) Large cell carcinoma
C) Squamous cell carcinoma
D) Mesothelioma
E) Bronchial carcinoid tumor
Correct Answer: C) Squamous cell carcinoma
Rationale: Squamous cell carcinoma is highly correlated with smoking. It tends to be
located centrally near the large bronchi, often presenting with symptoms of airway
obstruction or hemoptysis.
Question 12
A patient with tuberculosis (TB) has "tubercles" visible on a chest X-ray. What do these
structures represent?
A) Areas of active bacterial replication and spread.
B) Fluid-filled cysts within the alveoli.
C) Granulomas consisting of a central area of necrosis surrounded by macrophages and
lymphocytes.
D) Malignant tumors triggered by the mycobacterium.
E) Scars from a previous viral pneumonia.
