Nervous+13

The Nervous System Group:Olivia C,Mikayla F, Matt V.
Did you know that you wouldn't exist with out your nerves? Your spinal cord is made up of your brain,an enormous system of nerves. It threads through your entire body. Your brain uses info that it receives from your nerves to coordinate all of your actions and reactions. Nerves are thin thread of cells called neurons that run through out your body Nerves pass along messages by a kind of electricity.Nerves are thin.Some are small and some up to 2-3 feet long!All of them are shaped like stars which have to been pulled at each end to make long fingers.

The ** nervous system ** is the part of animal's body that coordinates the voluntary and involuntary actions of the animal and transmits signals between different parts of its body. In most types of animals it consists of two main parts, the central nervous system and the peripheral nervous system. The central nervous system connects to pretty much every other part of the body and the peripheral nervous system consists nerves. The nervous system also contains the brain and the spinal cord. The nervous system is defined by the presence of a special type of cell called the nerve cell. Neurons have special structures that allow them to send signals rapidly and precisely to other cells. They send these signals in the form of electric waves traveling along thin fibers, which cause chemicals to be released at junctions. A cell that receives a synaptic signal from a neuron may be excited, inhibited, or otherwise modulated. The connections between neurons form neural circuits that generate an organism's perception of the world and determine its behavior. Along with neurons, the nervous system contains other cells which provide support. The only animals that have no nervous system at all, have very simple body plans. The nervous systems of comb jellies d(e.g., anemones, hydras, corals and jellyfishes) consist of a diffuse nerve net. All other types of animals, with the exception of a few types of worms, have a nervous system containing a brain, a central cord (or two cords running in, and nerves radiating from the brain and central cord. The size of the nervous system ranges from a few hundred cells in the simplest worms, to on the order of 100 billion cells in humans. At the most basic level, the function of the nervous system is to send signals from one cell to others, or from one part of the body to others. The nervous system is susceptible to malfunction in a wide variety of ways, as a result of genetic defects, physical damage due to trauma or poison, infection, or simply aging. The medical specialty of studies the causes of nervous system malfunction, and looks for interventions that can prevent it or treat it. In the peripheral nervous system, the most commonly occurring type of problem is failure of nerve conduction, which can have a variety of causes cluding and demyelinating disorders such asand is the field of science that focuses on the study of the nervous system. The nervous system contains two main catigories or types of cells: nerouns glial cells. xx