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The fight-or-flight response is a physiological reaction to threats, involving the sympathetic nervous system and adrenaline release. It prepares the body for action by increasing heart rate, dilating pupils, and enhancing oxygen intake. This response has three phases: alarm, resistance, and exhaustion, with potential health impacts if overactivated. Understanding this response is crucial for recognizing how our bodies react to stress and danger in both ancient and modern contexts.
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The fight-or-flight response is an instinctive physiological reaction to a perceived threat
Sympathetic nervous system
The sympathetic nervous system is responsible for initiating the fight-or-flight response
Hormonal changes
The fight-or-flight response involves a series of hormonal changes, including the release of adrenaline
The fight-or-flight response includes an accelerated heartbeat, pupil dilation, and a release of adrenaline
The fight-or-flight response is activated by the sympathetic nervous system and involves the release of adrenaline and noradrenaline
Alarm phase
The alarm phase involves immediate activation of the sympathetic nervous system
Resistance phase
The resistance phase is characterized by the body's efforts to cope with the stressor while maintaining a state of readiness
Exhaustion phase
The exhaustion phase can occur if the stressor continues or the response is frequently activated, leading to depleted energy reserves and a weakened immune system
Adrenaline is a hormone secreted by the adrenal glands that plays a vital role in the fight-or-flight response, including increasing blood circulation, heart rate, and energy supply
Blood flow and oxygen intake
Adrenaline narrows blood vessels and relaxes bronchioles to prioritize blood flow to muscles and maximize oxygen intake
Energy conversion
Adrenaline facilitates the conversion of glycogen to glucose for energy during the fight-or-flight response
The fight-or-flight response has evolutionary significance as individuals with a robust response were more likely to survive dangerous situations and pass on their genes
The fight-or-flight response can be elicited by various stressors, including physical danger and modern stressors like public speaking
00
During the fight-or-flight response, the body experiences an increased ______, pupil ______, and a surge of ______.
heartbeat
dilation
adrenaline
01
Sympathetic nervous system trigger
Activated by hypothalamus in response to threat.
02
Effects of adrenaline and noradrenaline
Increase cardiac output, dilate bronchioles, pupil dilation.
