Sympathetic and Parasympathetic Effects


The sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. The parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions. The effects of the parasympathetic nervous system can be summarized by the phrase ‘rest and digest‘. Let’s look at an example of how these two systems function in response to changes in the environment.