What effect do the sympathetic and parasympathetic parts of the autonomic nervous system have on the body? What does it matter?

The sympathetic autonomic nervous system works when a person (or not a person) is under stress. All processes in terms of digestion slow down, the heartbeat accelerates, sexual function decreases, the release of glucose into the blood increases, pupils dilate, salivation is suppressed, increased sweat secretion, bronchial dilation, relaxation In the case of the parasympathetic system, on the contrary, it matters in survival. The body tries to survive and experiences stress, it slows down functions that are not needed at the moment.