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 ["A","D"]
Explanation
A. Surgical emergencies cannot be excluded:
If there is a possibility of a surgical emergency (such as a ruptured ectopic pregnancy or an abscess), hospitalization is necessary for observation and treatment.
B. The patient uses no contraceptives:
While contraception use may affect the risk of PID, it doesn't directly determine whether hospitalization is needed.
C. The patient has a history of miscarriage:
A history of miscarriage is not a specific indication for hospitalization in PID cases.
D. The diagnosis is uncertain:
If PID is suspected but the diagnosis is uncertain, hospitalization may be required for further diagnostic workup and close monitoring.
E. There is a history of STIs:
A history of STIs increases the risk of PID but doesn't necessarily require hospitalization.
F. C-reactive protein levels are low:
C-reactive protein (CRP) is an inflammatory marker, but low levels do not indicate that hospitalization is not needed.
Correct Answer is A
Explanation
A. Having greater than 50 moles and green or blue eyes:
Risk factors for melanoma include having many moles, fair skin, light-colored eyes, and history of sunburns.
B. Intermittent claudication and diabetes:
These are vascular and metabolic problems, not related to melanoma risk.
C. Black or brown hair and darker pigmented skin:
Darker skin provides some natural protection against UV radiation, reducing melanoma risk (although melanoma can still occur).
D. Younger than 18 years of age and obesity:
Age under 18 and obesity are not primary risk factors for melanoma. Cumulative sun exposure and genetic predisposition are much more relevant.
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