Immune System . Chapter 21. Immune System. Functional body system Structures are cells not organs Provides immunity Recognizes ‘self’ from ‘non-self’ Fights pathogens and infections Destroy cancer cells Isolate and remove foreign substances Divisions Innate immunity (non-specific)
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Image from Purves et al., Life: The Science of Biology, 4th Edition, by Sinauer Associates (www.sinauer.com) and WH Freeman (www.whfreeman.com)