It makes a lot of sense to start this talk by defining the sympathetic nervous system. The sympathetic nervous system (known in laymen’s terms as the “fight-or-flight” response) is the body’s activation of processes that prepare itself for demonstrative physical response. This is largely a reflexive response to new and foreign stimuli, and is in constant contact with the bloodstream to monitor the balance of needs. The actions of the sympathetic nervous system are counteracted by the body’s parasympathetic nervous system, or its resting response. A good way to think of this is as a gas (sympathetic) and brake (parasympathetic) in a motor vehicle.