The sympathetic is the body’s response to a perceived threat. It is all so known as the fight or flight response. Sympathetic responses will increase heart rate and contraction, increase breathing rate and dilate the bronchial so more air can get into the lungs with oxygen and get carbon dioxide out. The sympathetic will dilate vessel to the necessary organs for survival like the brain, heart, lungs, muscles and constrict blood vessels not critical to lief like the digestive system.
How Your Body Controls Breathing. (2022, March 24). NHLBI, NIH. https://www.nhlbi.nih.gov/health/lungs/body-controls-breathing