Answer:
sympathetic nervous system
Step-by-step explanation:
The sympathetic nervous system is one of the divisions of the autonomic nervous system which regulates and controls involuntary body functions such as heart rate, breath rate, blood pressure. The sympathetic nervous system is specifically responsible for the unconscious, involuntary control of body functions and metabolism, initiating a fight or flight response whee b perceives stress or threat. These fight or flight responses, which include rapid respiration,intense respiration, increased heart, are activated by the sympathetic system.