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人体老化过程中免疫系统有何明显改变? 机体的免疫系统主要由两类淋巴细胞所构成,即T细胞和B细胞.T细胞是依赖于胸腺的淋巴细胞,它是担任细胞免疫功能的主要细胞,主要职能是攻击和破坏外来细胞(如移植的细胞)和异常细胞(如癌细胞).B细胞是直接由骨髓中的干细胞衍生的另一类淋巴细胞,它是担任体液免疫的主要细胞.主要职能是释
What are the significant changes in the immune system during aging? The body’s immune system is mainly composed of two types of lymphocytes, namely T cells and B cells. T cells are lymphocytes that are dependent on the thymus, and they are the main cells that serve as cellular immune functions. The main function is to attack and destroy foreign cells (such as transplanted cells) and abnormal cells (such as cancer cells). B cells are another type of lymphocytes that are directly derived from stem cells in the bone marrow, and it is the main cell that serves as humoral immunity. The main function is to release