Older adults generally mount lower immune responses to vaccines.
Which age-related change is likely to contribute to these lower immune responses?
Lower number of complement proteins
Decreased populations of naïve T cells
Impaired primary defenses
Insufficient time outdoors
The Correct Answer is B
Naïve T cells are a type of white blood cell that has not encountered a specific antigen before and are ready to respond to new infections. As people age, the number of naïve T cells decreases due to the shrinking of the thymus gland, which produces and matures T cells. This reduces the ability of the immune system to recognize and fight new pathogens and lowers the effectiveness of vaccines.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
HIV stands for human immunodeficiency virus, a virus that infects and destroys CD4+ T cells, which are a type of white blood cell that coordinates the immune response against foreign invaders. HIV can cause acquired immunodeficiency syndrome (AIDS), which is a condition where the immune system becomes severely weakened and unable to fight off common infections and cancers. HIV can be transmitted through sexual contact, blood transfusion, needle sharing, or mother-to-child transmission.
Correct Answer is A
Explanation
This condition is an inflammation of the pericardium, which is the thin layer of tissue that surrounds and protects the heart. The inflammation can cause fluid to accumulate in the pericardial space, which can compress the heart and impair its function. The symptoms of pericarditis may include chest pain that worsens with breathing or lying down, shortness of breath, fever, chills, sweating, or low blood pressure.
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