Immune system - Wikipedia
https://en.wikipedia.org/wiki/Immune_system
OverviewLayered defenseSurface barriersInnate immune systemAdaptive immune systemPhysiological regulationDisorders of human immunityManipulation in medicineThe immune system is a network of biological systems that protects an organism from diseases. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinters, distinguishing them from the organism's own healthy tissue. Many species have two major subsystems of the immune system. The innate immune system
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