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整个免疫系统包括免疫器官、免疫活性细胞及免疫因子。免疫器官根据其发生和作用的不同,分为中枢免疫器官和周围淋巴器官。前者包括胸腺、骨髓和类(腔上)囊,是免疫活性细胞分化成熟为T或B细胞的场所;后者包括脾脏、淋巴结以及其他无被膜的淋巴组织(主要在肠道和呼吸道粘膜),是接受抗原刺激产生免疫虚答的场所。免疫活性细胞一般是
The entire immune system includes immune organs, immune cells and immune factors. Immune organs according to their occurrence and role of different, divided into central immune organs and peripheral lymphoid organs. The former includes the thymus, the bone marrow, and the class (supracavitary) sac, where immunocompetent cells differentiate into T or B cells; the latter includes the spleen, lymph nodes, and other uncoated lymphoid tissues (primarily in the gut and respiratory mucosa) Is to receive antigen stimulation immune immune response place. Immunocompetent cells are generally