Answer: Autonomic nervous system
Step-by-step explanation:
Autonomic nervous system(ANS) is the system that helps management of internal organ functions, heartbeat and other digestive process in the body. It also controls muscles and organs of the body that are not managed voluntarily.Body parts on which this system's action takes place are stomach, bladder, intestine etc.
When automatic nervous system faces over-sensitivity then it can tend to generate intense sensory neuron response in normal conditions making it seem like a major situation.