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What are the functions of the immune system? Without the body's own defenses, we would not be able to fight harmful organisms or substances from outside or threatening changes within our body and … The overall function of the immune system is to prevent or limit infection.
It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and objects, such as wood splinters â€distinguishing them from the organism's own … The immune system works to keep germs and other foreign substances out of the body and destroy any that get in. It's made up of a complicated network of cells and organs.