The<unk>  comprises the cells and mechanisms that defend the host from infection by other organisms, in a non-specific manner. This means that the cells of the<unk>  system recognize, and respond to, pathogens in a generic way, but unlike the adaptive immune system, it does not confer long-lasting or protective immunity to the host.<unk> s provide immediate defense against infection, and are found in all classes of plant and animal life.
Innate immune system
Adaptive immune system
Visual perception
Complement system
Hematopoiesis
Coagulation
Haptic perception
Dynamical system