Stimulation of the sympathetic nervous system causes flight , fight and freeze response, it can also regulate blood pressure, body temperature, Pupil dilation. It also increase heart rate, widen bronchial passages, decrease motility of the large intestine, constrict blood vessels, increase peristalsis in the esophagus, cause pupillary dilation, goose bumps and sweating, and raise blood pressure.
The evolutionary theory aspect of the biological perspective maintains that natural selection has favored certain traits over the course of human history, resulting in specific, current traits.
