Nervous+System

The Nervous System
= by Ivy Huang  = =__**Organs involved in the Nervous System**__= = The nervous system is made up of the brain, the spinal cord, and a network of nerve cells that runs though the whole body. The brain plays a very important role in the nervous system. It interprets the messages sent from the nerves. The spinal cord also plays a major role, it sends messages to and from the brain. Our spinal cords process all the information and it controls our automatic reactions such as our reflexes. Nerves are thin threads of nerve cells called neurons. Together, the nerves carry messages to the brain. For example, think of the neurons as the wire on a telephone, your voice is carried by the neurons though the wire and eventually it makes it to the phone, the brain. = == There are two types of nerves systems. The central nerve system is also known as the “main switch-board” it controls and coordinates all the actives of the body. The CNS consists of the brain and the spinal cord; it’s responsible for receiving and interpreting sign from the peripheral nervous system. The PNS detects and sends electric impulses used in the nervous system. == == There are many types of nerves. One of them are; sensory nerves. The jobs of sensory nerves include; telling the brain how something feels and if it’s rough, painful etc. They’re generally connected to the brain through the spinal cord. Another type of nerve is called motor nerves. Motor nerves are responsible for sending messages from the brain to all glands and muscles in the human body. Messages like these are sent by chemistry and electricity. == == Neurons are shaped like stars. Neurons are connected by their long “fingers”. When the neurons are stimulated by heat, cold, touch and sound they generate an electric pulse. The pulse travels all corners of the neuron when it gets to the last edge it needs the help of chemicals. The chemicals help the electric pulse travel from neuron to neuron. == == Without our nervous system, we would just be a lifeless, unmoving piece of skin and muscle. Our nervous system allows us to think, speak, walk, eat, talk etc. and it transfers messages from the brain to the body. Our nerves are the communication cables within out body and they move the message to certain parts of the body. == == The nervous system plays a really big part in the human body. If one thing goes wrong, the whole system shuts down or doesn’t work properly. The following are some problems you might face if your nervous system wasn’t working the way it was supposed to: ==

Alzheimer’s disease: a problem that occurs mostly to older people. Some sighs of AD are: memory loss, aggressive behaviour and unable to do simple tasks.
== Autism: it causes kid to see and experience the world differently. Kids with autism are often shy and keep to themselves. They also react to things differently, for example; sounds that might sound normal to us may cause an autistic kid to cover his/her ears. == == Concussions: happens when the brain is moved and knocked against the surface of the skull. When this happens it temporally changes the function of the brain. When someone gets a concussions happen, if the brain is injured then it will cause many long-lasting problems such as having trouble moving, learning and speaking. ==

Sources:
Richard, Walker, and Nick Abadzis. __Dr. Frankenstein's Human Body Book: The Monstrous Truth about How Your Body Works__. DK Publishing, Inc., 2008. __Nervous System__. Discovery Kids. 2011 .

__The Human Nervous System__. Biology Online. 2011 .
 * Brain and Nervous SystemKids Health. 2011 .[]

__Nervous System Diseases__. University of Maryland. 2011 . || Nerves use eletricity and chemicals to move pulses from nerve to nerve. The Central Nervous System consits of the brain and the spinal cord.
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