What cells are involved in immunity?
Disease description:
Hello doctor, I'd like to ask, what kind of cells are involved in immunity? Recently I saw a topic about immune cells on TV, but I was interrupted and couldn't finish watching it. I'm particularly interested in this subject and would like to learn more.
Doctor's answer (1)
Dr. Liu Aihua
Immunity is the body's ability to defend against external threats such as bacteria and viruses, primarily regulated by the immune system within the organism. The immune system mainly consists of two types: cellular immunity and humoral (antibody-mediated) immunity. Cellular immunity is composed of various types of immune cells, including macrophages, B cells, natural killer (NK) cells, and others. These cells monitor potential harmful metabolic substances within the body and respond to foreign invaders to protect the organism from damage. For example, macrophages can engulf and destroy harmful foreign substances; B cells secrete antibodies; and natural killer cells can recognize and eliminate cells bearing specific antigens. NK cells can also identify and destroy cancer cells, thereby protecting the body against cancer. Thus, cellular immunity serves as a crucial mechanism in defending the body against external harmful agents.
