In biology, a<unk> , or<unk>  action, is an involuntary, unplanned sequence or action and nearly instantaneous movement in response to a stimulus. A<unk>  is made possible by neural pathways called<unk>  arcs which can act on an impulse before that impulse reaches the brain. The<unk>  is then an automatic response to a stimulus that does not receive or need conscious thought.
Reflex
Sidaction
Stimming
Blanch 
Retching
Face
Pruning
Punding