<unk>  is seen as form of emotionally charged aggressive behavior. In everyday speech it is more commonly used as a synonym for anger and aggression. It appears in several psychological theories. For instance it is a facet of neuroticism in the NEO PI, and forms part of personal construct psychology, developed by George Kelly.
Hostility
Vasoactivity
Anesthetic
Digestion
Nociception
Secretomotor
Bleeding
Excretion