,UT Tyler NURS 5350 Exam 4 | Advanced Pathophysiology (2026)
Q&A
1. Which of the following best describes the primary pathophysiological mechanism of an
acute confusional state (delirium)?
A) Gradual, progressive loss of cognitive function over months to years
B) Sudden onset of impaired attention and awareness due to an underlying medical
condition
C) Permanent structural damage to the cerebral cortex from chronic ischemia
D) Autoimmune destruction of myelin in the central nervous system
Correct Answer: Sudden onset of impaired attention and awareness due to an
underlying medical condition
Rationale: Delirium is characterized by an acute, sudden onset of impaired attention and
awareness that fluctuates over the course of the day. It is typically caused by an underlying
medical condition, medication, or substance withdrawal. Dementia, in contrast, involves a
gradual, progressive decline in cognition.
2. What is the primary function of the Circle of Willis in cerebral circulation?
A) To produce cerebrospinal fluid for the central nervous system
B) To provide collateral blood flow to the brain if one vessel is occluded
C) To regulate the permeability of the blood-brain barrier
D) To drain deoxygenated blood from the brain into the venous sinuses
Correct Answer: To provide collateral blood flow to the brain if one vessel is occluded
,Rationale: The Circle of Willis is a ring of interconnected arteries at the base of the brain
that provides collateral circulation. If one of the major arteries supplying the brain
becomes occluded, blood can be rerouted through this anastomotic network to maintain
perfusion. This protects against ischemic injury.
3. Which term refers to the loss of tendon reflexes, often seen in conditions affecting the
lower motor neurons or peripheral nerves?
A) Areflexia
B) Hyperreflexia
C) Clonus
D) Spasticity
Correct Answer: Areflexia
Rationale: Areflexia is the absence of deep tendon reflexes. It is a hallmark of lower
motor neuron lesions and peripheral neuropathies, such as Guillain-Barré syndrome.
Hyperreflexia and clonus are signs of upper motor neuron lesions, and spasticity is
increased muscle tone.
4. According to pathophysiological principles, what initiates a seizure?
A) Hyperexcitability of neurons leading to abnormal, excessive electrical discharge
B) Loss of myelin in the peripheral nervous system
C) Degeneration of dopaminergic neurons in the substantia nigra
D) Accumulation of amyloid plaques in the cerebral cortex
Correct Answer: Hyperexcitability of neurons leading to abnormal, excessive electrical
discharge
, Rationale: Seizures are initiated by hyperexcitability of a group of neurons in the brain,
which then fire abnormally and excessively. This can be caused by electrolyte imbalances,
infections, tumors, or genetic mutations. The abnormal electrical activity can spread to
other brain regions, causing a seizure.
5. A patient presents with a unilateral headache that worsens with movement and is
associated with nausea and photophobia. What is the most likely diagnosis?
A) Tension headache
B) Migraine headache
C) Cluster headache
D) Sinus headache
Correct Answer: Migraine headache
Rationale: Migraine headaches are typically unilateral, throbbing, and worsen with
physical activity. They are often accompanied by nausea, vomiting, photophobia, and
phonophobia. Tension headaches are bilateral and pressing, and cluster headaches cause
severe unilateral pain around the eye.
6. What is the most common cause of increased intracranial pressure?
A) Cerebral edema
B) Decreased cerebrospinal fluid production
C) Increased venous return from the brain
D) Atrophy of the cerebral cortex
Correct Answer: Cerebral edema
Q&A
1. Which of the following best describes the primary pathophysiological mechanism of an
acute confusional state (delirium)?
A) Gradual, progressive loss of cognitive function over months to years
B) Sudden onset of impaired attention and awareness due to an underlying medical
condition
C) Permanent structural damage to the cerebral cortex from chronic ischemia
D) Autoimmune destruction of myelin in the central nervous system
Correct Answer: Sudden onset of impaired attention and awareness due to an
underlying medical condition
Rationale: Delirium is characterized by an acute, sudden onset of impaired attention and
awareness that fluctuates over the course of the day. It is typically caused by an underlying
medical condition, medication, or substance withdrawal. Dementia, in contrast, involves a
gradual, progressive decline in cognition.
2. What is the primary function of the Circle of Willis in cerebral circulation?
A) To produce cerebrospinal fluid for the central nervous system
B) To provide collateral blood flow to the brain if one vessel is occluded
C) To regulate the permeability of the blood-brain barrier
D) To drain deoxygenated blood from the brain into the venous sinuses
Correct Answer: To provide collateral blood flow to the brain if one vessel is occluded
,Rationale: The Circle of Willis is a ring of interconnected arteries at the base of the brain
that provides collateral circulation. If one of the major arteries supplying the brain
becomes occluded, blood can be rerouted through this anastomotic network to maintain
perfusion. This protects against ischemic injury.
3. Which term refers to the loss of tendon reflexes, often seen in conditions affecting the
lower motor neurons or peripheral nerves?
A) Areflexia
B) Hyperreflexia
C) Clonus
D) Spasticity
Correct Answer: Areflexia
Rationale: Areflexia is the absence of deep tendon reflexes. It is a hallmark of lower
motor neuron lesions and peripheral neuropathies, such as Guillain-Barré syndrome.
Hyperreflexia and clonus are signs of upper motor neuron lesions, and spasticity is
increased muscle tone.
4. According to pathophysiological principles, what initiates a seizure?
A) Hyperexcitability of neurons leading to abnormal, excessive electrical discharge
B) Loss of myelin in the peripheral nervous system
C) Degeneration of dopaminergic neurons in the substantia nigra
D) Accumulation of amyloid plaques in the cerebral cortex
Correct Answer: Hyperexcitability of neurons leading to abnormal, excessive electrical
discharge
, Rationale: Seizures are initiated by hyperexcitability of a group of neurons in the brain,
which then fire abnormally and excessively. This can be caused by electrolyte imbalances,
infections, tumors, or genetic mutations. The abnormal electrical activity can spread to
other brain regions, causing a seizure.
5. A patient presents with a unilateral headache that worsens with movement and is
associated with nausea and photophobia. What is the most likely diagnosis?
A) Tension headache
B) Migraine headache
C) Cluster headache
D) Sinus headache
Correct Answer: Migraine headache
Rationale: Migraine headaches are typically unilateral, throbbing, and worsen with
physical activity. They are often accompanied by nausea, vomiting, photophobia, and
phonophobia. Tension headaches are bilateral and pressing, and cluster headaches cause
severe unilateral pain around the eye.
6. What is the most common cause of increased intracranial pressure?
A) Cerebral edema
B) Decreased cerebrospinal fluid production
C) Increased venous return from the brain
D) Atrophy of the cerebral cortex
Correct Answer: Cerebral edema
