Overview of Immune System. Immune System: the organ system that protects the human body from foreign substances, uncontrolled cell proliferation, and tissue disorganization . Pathogens. Several types of pathogens exist that pose a problem for the human body to maintain homeostasis (maximally healthy state)External Pathogens: viruses, bacteria, fungi, and protozoaInternal Pathogens: bacteria and tumor cells External microbes serve several useful functions, including fermentation and decom9442
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