Memory T cells can be up to ______ old.
weeks
days
months
years
decades
The Correct Answer is E
A. Weeks: Memory T cells persist far longer than a few weeks. While effector T cells die off quickly after an immune response, memory T cells are designed for long-term immunity rather than short-term survival.
B. Days: A lifespan of only days reflects the behavior of effector T cells during an acute response. Memory T cells, however, undergo homeostatic proliferation and survive well beyond this timeframe.
C. Months: Although memory T cells can certainly survive for months, this does not represent their full potential lifespan. They are known to persist long after the initial antigen exposure.
D. Years: Many memory T cells do survive for years, providing extended protection. However, in humans, the lifespan of memory T cells can surpass even this range, especially after certain viral infections.
E. Decades: Memory T cells can remain functional for decades, offering long-term immunity. Memory T cells from childhood infections can persist into old age, highlighting their exceptional longevity
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Nitrogen:Nitrogen makes up approximately 78% of the air we breathe, making it the most abundant gas in the atmosphere. It is largely inert and does not participate directly in human respiration.
B. Water vapor:Water vapor is present in variable amounts depending on humidity but generally constitutes a very small fraction of air, far less than nitrogen. Its concentration is not sufficient to be the highest component.
C. Carbon dioxide:Carbon dioxide is present at only about 0.04% in the atmosphere. Despite its critical role in respiration and pH regulation, it is not the major constituent of inhaled air.
D. Hydrogen:Hydrogen exists in trace amounts in the atmosphere and plays no significant role in the composition of breathable air. Its concentration is negligible compared to nitrogen or oxygen.
E. Oxygen:Oxygen makes up roughly 21% of atmospheric air, making it the second most abundant gas. While essential for cellular respiration, its concentration is much lower than that of nitrogen.
Correct Answer is A
Explanation
The immune system spans nearly every organ and tissue in the body because immune cells circulate continuously through the bloodstream and lymphatic system. Lymphoid tissues such as the bone marrow, thymus, lymph nodes, spleen, tonsils, Peyer’s patches, and mucous membranes all play key roles in immune defense. Organs like the skin, lungs, and gastrointestinal tract contain specialized immune cells that detect and respond to pathogens.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.