Editing Fight-or-flight response (section)

====Sympathetic nervous system====
{{See also|Sympathetic nervous system}}
The sympathetic nervous system originates in the [[spinal cord]] and its main function is to activate the arousal responses that occur during the fight-or-flight response.<ref name=":2">{{Cite book |last1=Myers |first1=David G. |title=Psychology |last2=DeWall |first2=C. Nathan |publisher=MacMillan Publishing |year=2021 |edition=13 |pages=422}}</ref> The sympathetic nervous system transfers signals from the dorsal hypothalamus, which activates the heart, increases vascular resistance, and increases blood flow, especially to the muscle, heart, and brain tissues.<ref name=":02">{{Cite journal |last1=Kozlowska |first1=Kasia |last2=Walker |first2=Peter |last3=McLean |first3=Loyola |last4=Carrive |first4=Pascal |date=2015 |title=Fear and the Defense Cascade: Clinical Implications and Management |journal=[[Harvard Review of Psychiatry]] |volume=23 |issue=4 |pages=263–287 |doi=10.1097/HRP.0000000000000065 |issn=1067-3229 |pmc=4495877 |pmid=26062169}}</ref> It activates the adrenal medulla, releasing catecholamines that amplify the sympathetic response. Additionally, this component of the autonomic nervous system utilizes and activates the release of [[norepinephrine]] by the adrenal glands in the reaction.<ref name="Autonomic Nervous System - Chudler2">{{cite web |last=Chudler |first=Eric |title=Neuroscience For Kids |url=http://faculty.washington.edu/chudler/auto.html |access-date=19 April 2013 |publisher=University of Washington}}</ref>