Sympathetic nervous system can accelerate heart rate; widen bronchial passages; increase perspiration (sweating); decrease motility (movement) of the large intestine; constrict blood vessels; increase peristalsis in the esophagus; cause pupil dilation, piloerection (goose bumps) and raise blood pressure.ympathetic nervous system can accelerate heart rate; widen bronchial passages; increase perspiration (sweating); decrease motility (movement) of the large intestine; constrict blood vessels; increase peristalsis in the esophagus; cause pupil dilation, piloerection (goose bumps) and raise blood pressure.