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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Epiglottitis:
Epiglottitis is a life-threatening condition causing airway obstruction, drooling, severe sore throat, not just hoarseness.
B. Laryngitis:
Laryngitis involves inflammation of the larynx (vocal cords), causing hoarseness and dry cough.
C. Bronchitis:
Bronchitis involves inflammation of the bronchi, causing productive cough, not primarily hoarseness.
D. Pharyngitis:
Pharyngitis is sore throat inflammation, not primarily affecting the vocal cords.
Correct Answer is C
Explanation
A. Tuberculosis:
TB is a lung infection, not commonly associated with secondary hypertension.
B. Endocarditis:
Endocarditis is an infection of the heart valves, leading to emboli and heart failure but not directly causing hypertension.
C. Obstructive sleep apnea:
OSA can cause secondary hypertension due to intermittent hypoxia and sympathetic nervous system activation during sleep.
D. Polycythemia:
Polycythemia increases blood viscosity, which can lead to increased blood pressure, but it's a less common cause than conditions like OSA, renal disease, or endocrine disorders for secondary hypertension.
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