The Sympathetic Nervous System
The sympathetic nervous system is a division of the autonomic nervous system that becomes activated in response to stressful or high-arousal situations. This activation triggers the 'fight-or-flight' response, a set of physiological changes that were evolutionarily adaptive for ancestors, enhancing their chances of survival when facing threats.
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Related
The Parasympathetic Nervous System
Comparison of the Sympathetic and Parasympathetic Nervous Systems
The Sympathetic and Parasympathetic Nervous Systems' Role in Homeostasis
Physiological Response to a Sudden Event
Subdivisions of the Autonomic Nervous System
Analyzing Involuntary Physiological Responses