What are the characteristics of helper T cells?
They bind to infected cells and are activated by cytokines.
They activate B cells and produce small cells called cytokines
They destroy infected cells by producing proteins targeting cell membranes.
They are non-responsive during active infections.
The Correct Answer is B
A. They bind to infected cells and are activated by cytokines:
This describes cytotoxic T cells (CD8+ cells), which kill infected cells, not helper T cells.
B. They activate B cells and produce small cells called cytokines:
Helper T cells (CD4+ cells) stimulate B cells to produce antibodies and secrete cytokines to coordinate the immune response.
C. They destroy infected cells by producing proteins targeting cell membranes:
Again, this is the role of cytotoxic T cells, not helper T cells.
D. They are non-responsive during active infections:
Helper T cells are highly active during infections, directing other immune cells. They are not non-responsive.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Cerebral aneurysm:
A cerebral aneurysm involves a bulging blood vessel in the brain, which could lead to rupture and bleeding. It is not associated with tremors or bradykinesia.
B. Multiple sclerosis:
MS involves demyelination causing muscle weakness and visual disturbances, but not primarily tremors and bradykinesia.
C. Amyotrophic lateral sclerosis (ALS):
ALS affects motor neurons, leading to muscle weakness and atrophy, but does not typically present with tremors or benefit from deep brain stimulation.
D. Parkinson disease:
Parkinson disease features tremors, bradykinesia (slow movements), and abnormal gait. Deep brain stimulation is an advanced therapy for symptom management in Parkinson’s.
Correct Answer is A
Explanation
A. Botulism:
Botulism (caused by Clostridium botulinum) is a communicable disease that produces a toxin leading to rapid muscle paralysis, often starting within 6 hours of ingestion.
B. Malaria:
Malaria is a parasitic disease transmitted by mosquitoes that causes fever, chills, and anemia, not muscle paralysis.
C. Lyme disease:
Lyme disease, caused by Borrelia burgdorferi from tick bites, leads to joint pain, neurologic symptoms, and erythema migrans, but not acute paralysis.
D. West Nile virus:
West Nile virus can cause encephalitis and muscle weakness, but the paralysis onset is usually slower, not typically within 6 hours.
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