Fight or Flight Response

Definition

The fight or flight response is a natural reaction of the body to a perceived threat, preparing a person to either flee from danger or confront it.

Scientific / Technical Definition

The fight or flight response is an acute stress response that involves the activation of the autonomic nervous system, specifically the sympathetic nervous system, leading to the release of stress hormones like adrenaline and cortisol. This results in physiological changes that prepare the body for rapid action.

Benefits

• Improves survival chances by quickly preparing the body to respond to threats
• Increases alertness and focus during stressful situations
• Enhances physical performance through increased availability of energy

Examples

• An increased heart rate when faced with a danger
• Heightened senses and readiness to respond to sudden events

Additional Information

• Effects: The fight or flight response can influence heart rate, breathing rate, sensory perception, and can lead to a state of heightened alertness.

Related Terms

• Stress Response
• Autonomic Nervous System
• Adrenaline
• Cortisol

References

• The Biology of Fear: How the Brain Processes Threat
• Understanding the Stress Response - Harvard Health