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 Nervous System. Neuron cells are the principle units of the nervous system. Their function is to conduct nerve impulses transmitting information. The twelve billion neurons in our bodies vary greatly in size and shape; however they all have two general parts: a cell body and fibers.