NURS 231/NURS231 Module 9 V3 |
Pathophysiology Q&A with Rationale | Portage
Learning
1. The Monro-Kellie hypothesis explains the compensatory relationship between which three
components?
A. Brain tissue, blood, and cerebrospinal fluid
B. Neurons, glia, and synapses
C. Skull, scalp, and meninges
D. Oxygen, glucose, and carbon dioxide
Correct Answer: A
Explanation: The Monro-Kellie hypothesis states that the cranial vault is a fixed space
containing brain tissue, blood, and CSF. If the volume of one component increases, the
others must decrease to maintain a constant pressure. This principle is fundamental to
understanding the pathophysiology of increased intracranial pressure (ICP).
2. In the context of cerebral edema, which type is primarily caused by an increase in capillary
permeability allowing fluid to leak into the extracellular space?
A. Cytotoxic edema
B. Interstitial edema
C. Vasogenic edema
,D. Hydrocephalic edema
Correct Answer: C
Explanation: Vasogenic edema occurs when the blood-brain barrier is disrupted, leading
to the movement of water and proteins into the extracellular space. This is commonly seen
with brain tumors, abscesses, or trauma. It differs from cytotoxic edema, which involves
cellular swelling due to sodium-potassium pump failure.
3. A patient exhibits decerebrate posturing following a severe head injury. This physical
finding suggests damage to which area of the brain?
A. Cerebral cortex
B. Thalamus
C. Upper brainstem (Midbrain or Pons)
D. Cerebellum
Correct Answer: C
Explanation: Decerebrate posturing is characterized by the extension of the arms and legs
and pronation of the hands. It indicates a more severe neurological injury, specifically
involving the brainstem. In contrast, decorticate posturing involves flexion and suggests
damage to the cerebral hemispheres or internal capsule.
4. Which pathological feature is most characteristic of Alzheimer’s disease?
A. Dopamine deficiency in the basal ganglia
, B. Demyelination of peripheral nerves
C. Autoimmune destruction of acetylcholine receptors
D. Amyloid-beta plaques and neurofibrillary tangles
Correct Answer: D
Explanation: Alzheimer’s disease is characterized by the accumulation of extracellular
amyloid plaques and intracellular tau protein tangles. These structures disrupt neuronal
communication and lead to progressive cell death. The hippocampal region is typically the
first area affected, impacting short-term memory.
5. What is the primary pathophysiology behind Parkinson’s disease?
A. Loss of dopaminergic neurons in the substantia nigra
B. Excessive glutamate production
C. Demyelination of CNS axons
D. Chronic inflammation of the meninges
Correct Answer: A
Explanation: Parkinson’s disease results from the depletion of dopamine-producing
neurons in the substantia nigra pars compacta. Dopamine normally provides inhibitory
signals to the basal ganglia to smooth out motor movements. Without it, patients
experience tremors, rigidity, and bradykinesia.
Pathophysiology Q&A with Rationale | Portage
Learning
1. The Monro-Kellie hypothesis explains the compensatory relationship between which three
components?
A. Brain tissue, blood, and cerebrospinal fluid
B. Neurons, glia, and synapses
C. Skull, scalp, and meninges
D. Oxygen, glucose, and carbon dioxide
Correct Answer: A
Explanation: The Monro-Kellie hypothesis states that the cranial vault is a fixed space
containing brain tissue, blood, and CSF. If the volume of one component increases, the
others must decrease to maintain a constant pressure. This principle is fundamental to
understanding the pathophysiology of increased intracranial pressure (ICP).
2. In the context of cerebral edema, which type is primarily caused by an increase in capillary
permeability allowing fluid to leak into the extracellular space?
A. Cytotoxic edema
B. Interstitial edema
C. Vasogenic edema
,D. Hydrocephalic edema
Correct Answer: C
Explanation: Vasogenic edema occurs when the blood-brain barrier is disrupted, leading
to the movement of water and proteins into the extracellular space. This is commonly seen
with brain tumors, abscesses, or trauma. It differs from cytotoxic edema, which involves
cellular swelling due to sodium-potassium pump failure.
3. A patient exhibits decerebrate posturing following a severe head injury. This physical
finding suggests damage to which area of the brain?
A. Cerebral cortex
B. Thalamus
C. Upper brainstem (Midbrain or Pons)
D. Cerebellum
Correct Answer: C
Explanation: Decerebrate posturing is characterized by the extension of the arms and legs
and pronation of the hands. It indicates a more severe neurological injury, specifically
involving the brainstem. In contrast, decorticate posturing involves flexion and suggests
damage to the cerebral hemispheres or internal capsule.
4. Which pathological feature is most characteristic of Alzheimer’s disease?
A. Dopamine deficiency in the basal ganglia
, B. Demyelination of peripheral nerves
C. Autoimmune destruction of acetylcholine receptors
D. Amyloid-beta plaques and neurofibrillary tangles
Correct Answer: D
Explanation: Alzheimer’s disease is characterized by the accumulation of extracellular
amyloid plaques and intracellular tau protein tangles. These structures disrupt neuronal
communication and lead to progressive cell death. The hippocampal region is typically the
first area affected, impacting short-term memory.
5. What is the primary pathophysiology behind Parkinson’s disease?
A. Loss of dopaminergic neurons in the substantia nigra
B. Excessive glutamate production
C. Demyelination of CNS axons
D. Chronic inflammation of the meninges
Correct Answer: A
Explanation: Parkinson’s disease results from the depletion of dopamine-producing
neurons in the substantia nigra pars compacta. Dopamine normally provides inhibitory
signals to the basal ganglia to smooth out motor movements. Without it, patients
experience tremors, rigidity, and bradykinesia.
