The autonomous nervous system is the top control and regulation system in the body. The two main nerves, the sympathetic nerve (SN) and the parasympathetic nerve (PN) as counterplayers control and regulate the essential basic functions (vital functions) of the organism, such as the metabolism, breathing, cardiovascular system, digestive system, hormone system, immune system, etc.
The SN mobilises in the event of stress and danger through neuronal and hormonal activation a maximisation access to the energy reserves to overcome the situation. The PN is reduced or deactivated entirely in this process.
After the situation resolved, the body can recover again. This allows the parasympathetic nerve to again assume its tasks of regeneration, repair and healing.