Some lymphocytes can survive as long as ______
weeks
days
decades
months
years
The Correct Answer is C
A. Weeks: While some activated lymphocytes may only survive for a few weeks after an immune response, memory lymphocytes are designed to persist much longer to provide lasting immunity.
B. Days: Effector lymphocytes, such as short-lived plasma cells, may function for days during an active immune response. However, this does not reflect the longevity of memory lymphocytes.
C. Decades: Memory lymphocytes, particularly memory T and B cells, can survive for decades. This long lifespan allows the immune system to “remember” pathogens encountered earlier in life and respond more rapidly upon re-exposure.
D. Months: Some lymphocytes can survive for months, but this is still short compared to memory cells that provide long-term immunity over decades.
E. Years: While memory lymphocytes can survive for many years, the most accurate term emphasizing their extreme longevity is decades, capturing their ability to persist through much of a person’s lifetime.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
The liver plays a central role in iron metabolism by storing excess iron in the protein ferritin. Ferritin safely binds iron, preventing it from catalyzing harmful free radical reactions, and releases it when the body needs it for processes such as hemoglobin synthesis. This storage mechanism helps maintain iron homeostasis and prevents iron deficiency or overload.
Correct Answer is D
Explanation
A. Common carotid artery:The carotid artery is often used to assess pulse and circulation to the brain, especially during emergencies, but it is not the standard site for routine blood pressure measurement.
B. Femoral artery:The femoral artery supplies blood to the lower limb and can be used in emergency or surgical settings, but it is not practical for routine noninvasive blood pressure monitoring.
C. Posterior tibial artery:This artery is located near the ankle and is primarily used to assess peripheral circulation, not standard blood pressure measurement, due to its distal location and difficulty in palpation.
D. Brachial artery:The brachial artery, located in the upper arm, is the standard artery for noninvasive blood pressure measurement using a cuff and sphygmomanometer. Its accessibility and proximity to the heart make it ideal for accurately assessing systemic arterial pressure.
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