The sympathetic division is a part of the autonomic nervous system, which controls involuntary bodily functions. It is responsible for the body's "fight or flight" response, preparing the body to react to stressful situations. This division increases heart rate, dilates airways, and redirects blood flow to essential muscles, enhancing physical performance during emergencies. The sympathetic division works alongside the parasympathetic division, which promotes a "rest and digest" state. Together, these divisions maintain the body's balance, ensuring it can respond effectively to both stress and relaxation. The sympathetic division primarily uses neurotransmitters like norepinephrine to transmit signals throughout the body.