Question

The heightened physical arousal that characterizes the fight-or-flight response involves the _____ branch of the nervous system.

Answer 1

The heightened physical arousal that characterizes the fight-or-flight response involves the sympathetic branch of the nervous system (SNS).The sympathetic nervous system together with the parasympathetic nervous system form the autonomic nervous system.
SNS comprises the preganglionic fibers that issue from the thoracic and upper lumbar levels of the spinal cord.

Answer 2

The answer is the sympathetic nervous system. The sympathetic nervous system is also called a fight or flight response nervous system. This is also a part of an autonomic nervous system, which is also included with another one is the parasympathetic nervous system. Through a series of interconnected neurons, the sympathetic nervous system operates.