Understand the body's response against microbes
Immune system means all means of defense that protects the body against infection.
While the penetration of microorganisms (viruses, bacteria, etc.) in the body of this organism multiply and cause disease. Some microbes produce toxins that are also toxic to the body (as in, tetanus, whooping cough, diphtheria). Recognition at the same time parts of the body of the microbe cells (antigens) and foreign elements. Result: the body activates the entire immune system tries to eliminate microbes by antibodies.