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 A
Explanation
Choice A reason: Hyperventilation causes decreased CO2 levels (respiratory alkalosis) due to rapid breathing from pain, anxiety, or restlessness. This matches the patient’s symptoms and blood gas results, making it the correct cause.
Choice B reason: Nephrolithiasis causes pain but doesn’t typically lead to hyperventilation or low CO2. Respiratory alkalosis from hyperventilation better explains the findings, so this is incorrect for the cause.
Choice C reason: Acute fracture causes pain but not necessarily hyperventilation or low CO2. Anxiety-driven hyperventilation is more likely to cause respiratory alkalosis, so this is incorrect for the primary cause.
Choice D reason: Urinary tract infection may cause discomfort but not low CO2 or hyperventilation. Anxiety and pain causing hyperventilation align with the blood gas, so this is incorrect.
Correct Answer is B
Explanation
Choice A reason: Dawn phenomenon involves morning hyperglycemia, not hunger, tachycardia, or confusion. Hypoglycemia from exercise causes these acute symptoms, so this is incorrect for the described episode in Type 1 diabetes.
Choice B reason: Hypoglycemia, often triggered by increased exercise, causes hunger, lightheadedness, tachycardia, pallor, headache, and confusion due to low blood sugar. This matches the symptoms, making it the correct cause for the patient’s episode.
Choice C reason: Hyperglycemia causes thirst, urination, and fatigue, not tachycardia or confusion. Hypoglycemia from exercise aligns with the acute, neuroglycopenic symptoms described, so this is incorrect for the cause.
Choice D reason: Somogyi effect involves rebound hyperglycemia after nocturnal hypoglycemia, not acute symptoms like hunger and confusion. Exercise-induced hypoglycemia fits the immediate presentation, so this is incorrect for the cause.
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