Sympathetic nervous system is a division of the nervous system that capacities to deliver limited changes, (for example, perspiring as a reaction to an expansion in temperature) and reflex modifications of the cardiovascular system
Under states of pressure, the whole Sympathetic nervous system is initiated, delivering a quick broad reaction called the battle or flight reaction
This reaction is described by the arrival of enormous amounts of epinephrine from the adrenal organ, an expansion in pulse, an expansion in heart yield, skeletal muscle vasodilation, cutaneous and gastrointestinal vasoconstriction, pupillary widening, bronchial enlargement, and piloerection. The general impact is to set up the person for inevitable risk
