Which cell has a role in developing cell-mediated immunity?
T cells
B cells
None of the above
All of the above
The Correct Answer is A
Choice A reason: T cells, including cytotoxic and helper T cells, drive cell-mediated immunity by directly attacking infected cells and coordinating immune responses. They target intracellular pathogens and tumors, forming the core of cellular immunity, making this the correct choice.
Choice B reason: B cells mediate humoral immunity, producing antibodies against extracellular pathogens. While critical for immune defense, they do not directly drive cell-mediated responses, which rely on T-cell activity, making this incorrect for cell-mediated immunity.
Choice C reason: “None of the above” is incorrect, as T cells play a central role in cell-mediated immunity. Their functions, like cytotoxicity and cytokine production, are essential for this immune response, making this an invalid choice.
Choice D reason: “All of the above” is incorrect, as only T cells, not B cells, are primarily responsible for cell-mediated immunity. B cells support humoral immunity, not the cellular response driven by T cells, making this an incorrect choice.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Latent phase follows seroconversion, not precedes infection. The correct sequence—exposure, infection, seroconversion, AIDS—reflects HIV progression. This option misorders the phases, making it incorrect for AIDS development.
Choice B reason: AIDS progresses through exposure (virus contact), infection (HIV enters body), seroconversion (antibody detection), and AIDS (advanced disease). This sequence accurately describes the disease’s history, making it correct.
Choice C reason: Symptomatic AIDS is not a distinct phase; AIDS itself is symptomatic. The standard progression includes exposure, infection, seroconversion, and AIDS, so “symptomatic AIDS” is incorrect.
Choice D reason: Window phase is part of seroconversion, not separate, and acute phase is early infection. The sequence—exposure, infection, seroconversion, AIDS—is clearer, so this is incorrect.
Correct Answer is A
Explanation
Choice A reason: Atherosclerosis erodes the vessel wall by forming plaques that weaken arterial layers, promoting aneurysm formation. This degenerative process destabilizes the wall, making it the correct effect in aneurysm development.
Choice B reason: Ischemia of the intima is not a primary atherosclerosis effect; plaques cause wall damage, not just intimal ischemia. Vessel wall erosion is more accurate for aneurysm formation, so this is incorrect.
Choice C reason: Atherosclerosis narrows vessels but doesn’t primarily obstruct them in aneurysm formation. Wall erosion and weakening lead to dilation, not blockage, so this is incorrect for aneurysm development.
Choice D reason: Atherosclerosis reduces nitric oxide, impairing vasodilation, but this isn’t directly linked to aneurysms. Vessel wall erosion by plaques is the key mechanism, so this is incorrect for the effect.
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