Immune System

Immune System

im·mune sys·tem

\i-ˈmyün\ sis-təm\

noun

A system of biological processes and structures within an organism that is designed to protect it against disease. In order to function correctly, an immune system must be able to detect a number of unwelcome pathogens, such as parasitic worms or viruses, and distinguish these harmful agents from the healthy tissue within the organism.

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