The Tibetan Terrier is a medium-size breed of dog originated in Tibet. Despite its name, it is not a member of the terrier group. The breed was given its name by European travellers who first encountered it, because of its resemblance to known terrier breeds.he Tibetan Terrier is a medium-size breed of dog originated in Tibet. Despite its name, it is not a member of the terrier group. The breed was given its name by European travellers who first encountered it, because of its resemblance to known terrier breeds.
The parasympathetic nervous system (PNS) controls homeostasis and the body at rest and is responsible for the body's rest and digest function. The sympathetic nervous system (SNS) controls the body's responses to a perceived threat and is responsible for the fight or flight response.he sympathetic nervous system (SNS) is one of two main divisions of the autonomic nervous system (ANS). Its general action is to mobilize the body's fight-or-flight response.
The autonomic system has two divisions. It consists of the sympathetic and parasympathetic nervous systems. The primary function of the sympathetic system is to stimulate your fight-or-flight response which is a physiological reaction that happens in response to a perceived harmful event, attack or threat to survival. The parasympathetic system enables you to maintain normal functions such as digesting and keeping the body at rest. The Structure of the Sympathetic Nervous System. Transmission of signals in the system is accomplished through a network of nerve cells called neurons.