Respuesta :
the immune system provides protection against cancer cells, bacteria, viruses, a person's own skin cells, prions, transplanted cells from a donor.
How does immune system provide protection?
The immune system defends the body against disease and infection, including cancer, and shields it from potentially harmful elements like germs and viruses. Immune system cells constantly circulate throughout the body, scanning for potential invaders such as bacteria. Antigens, which are proteins on the surface of the invading cells, are used by the immune system to identify invaders. Every substance or cell has a unique set of antigens, and every person's cells include "self-antigens" that are particular to that person. Self-antigens are found on normal human cells such thyroid, liver, and colon cells. Self-antigen-containing cells normally pose little danger. However, since invader germs do not come from the body, they do not carry self-antigens but rather what are referred to as "nonself-antigens. The immune system is built to recognize cells that contain non-self antigens as dangerous and react accordingly. To communicate with other immune cells and manage the body's response to threats, the majority of immune cells release cytokines (messengers).
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