Info taken from my.clevelandclinic.org
The sympathetic nervous system is a network of nerves that help your body activate it’s “fight-or-flight” response. It happens when you are stressed, in danger, or physically active.
Danger or stress activate the sympathetic nervous system.
- your pupils enlarge to let more light in to improve your vision
- increase in heart rate to improve the delivery of oxygen to other parts of the body
- relaxes airway muscles to improve lung function
- slows digestion to focus energy on other parts of the body
- activates energy stored in the liver
- Improved immune system and body’s repair process
It helps in situations where you need to act quickly.
Redheaded Jill 
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