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 C
Explanation
Barrett's esophagus is a condition in which the normal squamous epithelium of the esophagus is replaced by columnar epithelium due to chronic acid reflux. This can increase the risk of esophageal cancer and cause symptoms such as dysphagia, odynophagia, and a sensation of a lump in the throat.
Correct Answer is D
Explanation
A thrombus is a blood clot that forms inside a blood vessel or the heart, which can obstruct blood flow and cause complications such as ischemia or embolism. One of the factors that predispose thrombus formation is stasis of blood flow, which means slow or stagnant movement of blood in a vessel or chamber, which can allow platelets and fibrin to accumulate and form a clot.
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