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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 reflex is started by the sympathetic nervous system, which is responsible for many fight-or-flight responses. The muscle cells connected to the hair follicle have been visualized by actin immunofluorescence. [8] Arrector pili muscle. Arrector pili muscles (APM) are smooth muscles which connect the basement membrane to the hair follicle.
Reaction to stress—as in the flight-or-fight response—is thought to be elicited by the sympathetic nervous system and to counteract the parasympathetic system, which works to promote maintenance of the body at rest. The comprehensive functions of both the parasympathetic and sympathetic nervous systems are not so straightforward, but this ...
The fight-or-flight response, also known as the acute stress response, is set into action by the autonomic nervous system. [3] The autonomic nervous system is regulated by integrated reflexes through the brainstem to the spinal cord and organs.
Its action is described as being complementary to that of the sympathetic nervous system, which is responsible for stimulating activities associated with the fight-or-flight response. Nerve fibres of the parasympathetic nervous system arise from the central nervous system.
The clusters of the amygdala are activated when an individual expresses feelings of fear or aggression. This occurs because the amygdala is the primary structure of the brain responsible for fight or flight response. Anxiety and panic attacks can occur when the amygdala senses environmental stressors that stimulate fight or flight response.
The fight-or-flight response is a biological response of humans and other animals to acute stressors. Fight or Flight may also refer to: Fight or Flight, a documentary film; Fight or Flight (2025 film), a British action film; Fight or Flight, a 1996 book documenting battles from the soldier's perspective by military historian Geoffrey Regan
Fear is an unpleasant emotion that arises in response to perceived dangers or threats.Fear causes physiological and psychological changes. It may produce behavioral reactions such as mounting an aggressive response or fleeing the threat, commonly known as the fight-or-flight response.