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The fight-or-flight or the fight-flight-freeze-or-fawn [1] (also called hyperarousal or the acute stress response) is a physiological reaction that occurs in response to a perceived harmful event, attack, or threat to survival. [2] It was first described by Walter Bradford Cannon in 1915.
The activity of the sympathetic nervous system drives what is called the "fight or flight" response. [4] The fight or flight response to emergency or stress involves increased heart rate and force contraction, vasoconstriction , bronchodilation , sweating , and secretion of the epinephrine and cortisol from the adrenal medulla , among numerous ...
The sympathetic nervous system is responsible for setting off the fight-or-flight response. [3] The parasympathetic nervous system is responsible for the body's rest and digestion response. [3] In many cases, both of these systems have "opposite" actions where one system activates a physiological response and the other inhibits it.
One common cause of the release of this hormone is the Fight-or-flight response. When the body encounters an external stimulus that is potentially dangerous, epinephrine is released from the adrenal glands. Epinephrine causes physiological changes in the body, such as constriction of blood vessels, dilation of pupils, increased heart and ...
It is recommended to name the SVG file “Ballistics, force diagram applied on a projectile in flight.svg”—then the template Vector version available (or Vva) does not need the new image name parameter.
The fight-or-flight response involves a general sympathetic nervous system discharge in reaction to a perceived stressor and prepares the body to fight or run from the threat causing the stress. Catecholamine hormones, such as adrenaline or noradrenaline , facilitate immediate physical reactions associated with a preparation for violent ...
The amygdala is known to have a role in the "fight-or-flight response", and the hippocampus functions to form memories of the stimulus and the emotions associated with it. [13] The role of the BNST in the acoustic startle reflex may be attributed to specific areas within the nucleus responsible for stress and anxiety responses. [12]
WP:MEDMOS#Sections includes an "Other animals" section. Like the Sexual differentiation article, the Fight-or-flight response article could use a heading style to indicate what section is about humans and what section is about non-human animals. With this edit, you moved the title from Fight-or-flight response to Fight-or-flight response (in ...