The Vagus nerve is the longest nerve in the body, it runs from the base of your brain to the organs within your body, and is part of the control system that makes many physiological changes to your body when your fight and flight kicks in. You know all those weird sensations of shakiness, fast heart rate, tight chest breathing, increased blood pressure, blushing, sweating or overheating, hypersensitivity to noise, lights etc. all that happens because of this nerve.

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