机体防御外邪侵犯的机能,通称抵抗力,也叫做免疫。多数学者认为免疫与变态反应似乎是两种截然不同的现象,但从本质上来看,二者同是免疫学反应;变态反应是免疫过程中的特殊表现形式,因为二者可以由同一抗原引起。当抗原性质特殊或机体的免疫异常时,对人体有益的免疫反应可以转化为有害的过敏反应。人体的免疫系统大体上包括淋巴系统,补体系统和吞噬系统三个部分。这些系统如果不正常又可引起免疫缺 The function of body defense against evil, commonly known as immunity, is also called immunity. Most scholars believe that immune and allergic reactions seem to be two distinct phenomena, but in essence, the two are immunological reactions; allergy is a special manifestation of the immune process, because the two can be caused by the same antigen. When the nature of the antigen is abnormal or the body’s immune abnormalities, beneficial immune response to the human body can be converted into a harmful allergic reaction. The body’s immune system includes the lymphatic system, complement system and phagocytic system in three parts. If these systems are not normal but can cause immune deficiency