Stress and the nervous system

The brain is engaged in a constant control and feedback loop with the body, even when you perceive yourself to be completely idle, even when you are sleeping. It does this by communicating through the nervous system, which can be divided into sub categories including the central, (brain and spinal cord), and the peripheral (autonomic and somatic). Stress enters into this system most clearly through a subdivision of the autonomic nervous system known as the sympathetic nervous system. 

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