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 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.
Correct Answer is D
Explanation
26. A patient is admitted to the emergency department (ED) following an overdose of acetaminophen (Tylenol) and is diagnosed with cirrhosis. Which laboratory finding is consistent with the diagnosis?
- elevated serum protein hyperproteinemia
- decreased serum liver enzymes (ALT).
- elevated number of platelets thrombocytosis)
- decreased level of clotting factors.
Correct answer:
A. Elevated serum protein hyperproteinemia: In cirrhosis, serum protein levels, particularly albumin, are often decreased due to impaired liver synthesis.
B. Decreased serum liver enzymes (ALT): In cirrhosis, liver enzyme levels such as ALT (alanine aminotransferase) are typically elevated due to liver damage and inflammation.
C. Elevated number of platelets (thrombocytosis): Cirrhosis often leads to thrombocytopenia (decreased platelet count) due to splenomegaly and decreased production of thrombopoietin.
D. Decreased level of clotting factors: The liver synthesizes most clotting factors, and in cirrhosis, the production of these factors is impaired, leading to decreased levels and increased bleeding risk.
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