This part of the nervous system houses the life support systems and is essential for life.

The part of the nervous system that houses the life support systems and is essential for life is the Autonomic Nervous System (ANS). The ANS is responsible for controlling bodily functions not consciously directed, such as breathing, heartbeat, and digestive processes. It is divided into two main branches: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. The parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.