Review the major aspects of how the human immune system functions.

Review the major aspects of how the human immune system functions. How is the proper functioning of this system of major importance to all other systems in the body? What kinds of things can go wrong with the immune function and how do these problems interfere with human life? 3 sources APA FORMAT
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Human immune system is a complex body system influenced by internal and external factors whose primary role is protecting the body from all forms of infections. It is the body’s most complex systems designed to protect the body from viral attacks, attack from pathogens namely parasites, bacteria, and viruses. This is a self-sustaining and tolerant body process that does not attack the body and its organ systems (Persaud, 1977). It is composed of cells, tissues and organs that work in harmony in protecting and attacking all disease causing micro-organisms……………………………………..