You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Organ which undergoes involution: March 2005 and explain in detail?
Ans. D: ThymusOne of the major characteristics of veebrate immunology is thymic involution, the shrinking of the thymus with age, resulting in changes in the architecture of the thymus and a decrease in tissue mass.This process has been conserved in almost all veebrates, from birds, teleosts, amphibians to reptiles, though the thymuses of a few species of sharks are known not to involute.Since the thymus is the organ responsible for T-lymphocyte (T cell) maturation, its regression has been linked to the reduction in immunosurveillance in the elderly.Though thymic involution has been linked to senescence, it is not induced by senescence as the organ stas involuting from a young age - as early as the first year of life in humans