A network of neurons in your body called the sympathetic nervous system aids in the "fight-or-flight" reaction. When you're under stress, in danger, or engaged in physical exercise, this system becomes more active.
One of the three divisions of the autonomic nervous system, along with the parasympathetic and enteric nervous systems, is the sympathetic nervous system (SANS or SYNS). The enteric nervous system is occasionally regarded as a component of the autonomic nervous system and other times as a separate entity.
The autonomic nerve system controls the body's automatic movements. The major function of the sympathetic nervous system is to activate the body's fight-or-flight response. However, in order to maintain homeostasis, it is continually active. The parasympathetic neural system, which drives the body to "eat and breed" before (then) "rest-and-digest," is said to be antagonistic to the sympathetic nervous system.
Pre-ganglionic and post-ganglionic neurons are both involved in the transmission of any signal through the sympathetic nervous system. The shorter preganglionic neurons migrate to a ganglion, frequently one of the paravertebral ganglia, where they synapse with a postganglionic neuron. They start in the thoracolumbar division of the spinal cord, notably at T1 to L2 and L3. Long postganglionic neurons spread across the majority of the body from there.
The U.S. helped Japan rebuild economically after WWII and has maintained a peaceful relationship. The U.S. occupied Japan for four decades to make sure they did not rebuild their military.
