Pine trees are evergreens with long, needle-shaped leaves. They are widely planted in North America, particularly in northern areas. Pine trees produce cones for propagation of the species. Pines are coniferous trees and there are about 100 or so species of pines world wide.
The nervous system has three general functions: a sensory function, an interpretative function and a motor function. 1  Sensory nerves gather information from inside the body and the outside environment. 2  The nerves then carry the information to central nervous system (CNS).
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.