The Autonomic Nervous System
The autonomic system controls aspects of the body that are usually not under voluntary control. The autonomic system is divided into two branches:
- Parasympathetic system: It helps maintain normal body functions and conserve physical resources. Once a threat is over, this system will slow the heart rate, slow the breathing, reduce blood flow to muscles, and constrict the pupils.
- Sympathetic system: This system prepares the body to expend energy to respond to environmental threats - the flight or fight response.
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