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 B
Explanation
Gestational diabetes mellitus (GDM) is a type of diabetes that develops during pregnancy and usually resolves after delivery. It is characterized by high blood glucose levels that can affect the health of both the mother and the fetus. Polydipsia (excessive thirst) and polyphagia (excessive hunger) are common symptoms of hyperglycemia (high blood glucose). Incontinence may occur due to increased pressure on the bladder from the growing uterus or from nerve damage caused by diabetes. An A1C test measures the average blood glucose level over the past two to three months and is used to diagnose and monitor diabetes. A normal A1C level is below 5.7%, while a level of 6.5% or higher indicates diabetes.
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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