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Brain and Nervous System
  
my particular Universe (including me)by brunosan on Flickr

The nervous system is part of the animal's body that coordinates the actions of the animal and transmits signals between different parts of it's body.  

It consists of two main parts: the CNS (central nervous system) and the PNS (peripheral nervous system) 
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A brain - I has itby everyone's idle on Flickr

The CNS contains the brain and the spinal cord. The brain is located inside the skull and connected to the spinal cord, moving down the neck.  
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Bartolomeo Eustachi: Peripheral Nervous System, c. 1722by brain_blogger on Flickr

The PNS consist mainly of nerves, which are long fibers that connect the CNS to every other part of the body. 
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774 - Neuron Connection - Patternby Patrick Hoesly on Flickr

At the cellular level, the nervous system is defined by the presence of a special type of cell called the neuron also known as the "nerve cell".

Neurons have special structures that allow them to send signals rapidly and precisely to other cells.
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Neuronby Ethan Hein on Flickr

They send these signals in the form of electro-chemical waves traveling along thin fibers called axons, which cause chemicals called neurotransmitters to be released at junctions called Synapses.

The synapses is where  the nerves impulses are transmitted and received.
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granule cell with axonby Functional Neurogenesis on Flickr

The axons transmit the nerve impulse away from the cell.

The receptors receive an impulse and pass it along to the other parts of the neuron.

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