What is the role of the ANS and its subdivisions of the sympathetic and parasympathetic?

The autonomic nervous system is responsible for the processes of regulation of organ systems, for the automation of the body. Sympathetic calving is responsible for the processes occurring in the body in a stressful situation: heart rate increases, salivation decreases, digestion slows down, pressure changes, pupil radius, etc. The parasympathetic section, on the contrary, slows down the heart rate, activates intestinal peristalsis, and so on. – acts in resting conditions, controls normal physiological processes.