The appendix is a curved and elongated blind tube located between the ileum and the cecum of the human body, which is an immune organ of the human body and has the following functions: 1. It has the function of regulating immunity and can play the role of a lymphatic organ to a certain extent, promoting the production of immunoglobulin antibodies in the human body and helping to promote the maturation of lymphocytes, which can play a certain degree of defense against diseases. 2. The appendix can absorb antigens in the intestinal tract to a certain extent and actively respond to them. 3. it can secrete digestive enzymes and can promote intestinal peristalsis and growth hormones. If the appendix is abnormally diseased and needs to be removed, it is very likely that it will have some effect on the immune system, but the effect will not be significant.