Answer:
sympathetic nervous system
Explanation:
The sympathetic nervous system controls essential parts of the body such as heart rate, body temperature, breathing, sweating, digestion, etc. It directs the rapid involuntary reaction of the body to dangerous or stressful situations. This system allows humans to make quick internal adjustments and to respond without thinking about it. Therefore whenever a body comes across a physical stress or challenging situations this system prepares the body either to flee or fight.
