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The nervous system

CNS and PNS:

The central nervous system is made up of the brain and the spinal cord, while the rest of
the nervous system is the peripheral nervous system.

1- The brain
2- A combination of the brain and the spinal cord (the
central nervous system)

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The autonomic nervous system includes all the motor neurones that supply to the internal

The Autonomic nervous system contains two more components to the nervous system.
These are the sympathetic nervous system and the parasympathetic nervous system.

The sympathetic nervous system is used to stimulate the body (E.G. make…

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Noradrenalin is the transmitter substance that carries the impulses across most of
the synapses.

The parasympathetic nervous system has all its nerve pathways begin at the
brain, the top of the spinal cord or the very base of the spinal cord, unlike the
sympathetic nervous system. In the parasympathetic nervous…

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The brain

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Little is known about the brain, however over the years scientists have put a lot of effort
into investigating the anatomy and physiology of the brain as well as how it works. The brain

is a cream coloured organ surrounded
and protected by the bones of the
cranium and also…

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chemical signals to go across it from cell to cell and neurone to neurone. Most types of
neurones contain an axon, which extends to distant parts of the body and connect with
thousands of synapses. They travel through the body in bundles called `nerves'. There are
hundreds of different types…

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nervous tissue is the main component of the nervous system (the brain, spinal cord and the
nerves which regulates and controls the body's functions.

The Hierarchy sum up of the Nervous system


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