Immune System and ImmunologyAbout This Hardback Immune system refers to the network of all the biological processes that protect an organism from diseases and foreign micro organisms. It detects a wide range of pathogens, cancer cells and other objects, distinguishes them from the healthy tissues of the organism and responds to them. There are two major subsystems of the immune system, namely, innate immune system and adaptive immune system. Innate immune system relies on the