The sympathetic nervous system is one of the parts of the peripheral nervous system. The sympathetic nerves originate in the vertebrate column beginning in the first thoracic segment of the spinal cord, extending upwards until the second or the third lumbar segments. Sympathetic nervous system, division of the nervous system that produces localized adjustments (such as sweating as a response to an increase in temperature) and reflex adjustments of the cardiovascular system.

The sympathetic nervous system activates what is often termed the fight or flight response. The parasympathetic nervous system (PNS) controls homeostasis and the body at rest and is responsible for the body's "rest and digest" function.

The sympathetic nervous system (SNS) controls the body's responses to a perceived threat and is responsible for the "fight or flight" response..

Under stress, the entire sympathetic nervous system …



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