Which response best connects the pathology of myasthenia gravis with its signs and symptoms (S&S)?
A sudden, explosive, disorderly charge of neurons causes a transient aberration in brain function
Loss of the myelin sheath surrounding peripheral nerves causes asymmetric weakness
Destruction of acetylcholine receptors causes muscle weakness with prolonged activity.
A bacterial inflammatory illness that causes headache and photophobia.
The Correct Answer is C
A. A sudden, explosive, disorderly charge of neurons causes a transient aberration in brain function: This describes the pathophysiology of seizures, not myasthenia gravis.
B. Loss of the myelin sheath surrounding peripheral nerves causes asymmetric weakness: This describes multiple sclerosis, not myasthenia gravis.
C. Destruction of acetylcholine receptors causes muscle weakness with prolonged activity: Myasthenia gravis is an autoimmune disease where antibodies attack acetylcholine receptors at the neuromuscular junction, leading to muscle weakness, especially after repeated use.
D. A bacterial inflammatory illness that causes headache and photophobia: This describes meningitis, not myasthenia gravis.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Decreased respirations and CO2 retention: A thyrotoxic crisis (thyroid storm) typically involves increased, not decreased, respiratory rates and CO2 retention due to increased metabolic activity.
B. Seizures and extreme tachycardia: Thyrotoxic crisis is characterized by severe symptoms including extreme tachycardia, fever, and potentially seizures due to excessive thyroid hormone levels.
C. Constipation and a swollen abdomen: Constipation and abdominal swelling are more typical of hypothyroidism rather than a thyrotoxic crisis.
D. Hypotension and bradycardia: Thyrotoxic crisis usually causes tachycardia and hypertension rather than bradycardia and hypotension.
Correct Answer is A
Explanation
A. Manifests as neurofibrillary tangles and amyloid plaques that cause a disruption of brain impulses: Alzheimer's disease is characterized by the accumulation of amyloid plaques and neurofibrillary tangles in the brain, leading to disrupted neural communication.
B. Is an inherited disorder that, most often, begins before the age of fifty: While there are inherited forms of Alzheimer's (early-onset), most cases are sporadic and occur after age 65.
C. Can be caused by increased cerebral levels of acetylcholine: Alzheimer's disease is associated with decreased levels of acetylcholine, not increased levels.
D. Causes unusual sensory sensations such as numbness and shooting pain (paresthesia): Paresthesia is not a typical symptom of Alzheimer's disease; it is more related to neurological or peripheral nerve disorders.
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