1 is a virus, bacteria, etc. Can resist the infection and invasion of external factors.
2. The ability to eliminate interfering cells in the body, maintain the stability of the body, deal with the aging, injury, death and degeneration of its own cells, and identify and deal with mutant cells and virus-infected cells in the body.
Extended data:
Immunity means that under the control of the central nervous system, various systems of the human body cooperate with each other and closely to ensure the normal life activities of the human body.
The immune system is a very important part. The main function of the immune system is to prevent the invasion of external pathogenic microorganisms and prevent various diseases.
In the process of resisting pathogenic microorganisms, the four members of the human immune system have clear responsibilities, which can not only fight independently, but also cooperate closely to adapt the human body to the complex and changeable external environment.
Baidu encyclopedia-resistance