Fight or flight意思

"Fight or flight" is a physiological response that occurs in animals, including humans, in response to a perceived threat or danger. This response is also known as the "acute stress response" or the "fight-or-flight response." It is a natural reaction that is designed to help the animal survive in a life-threatening situation.

When an animal or human perceives a threat, the sympathetic nervous system is activated, which triggers a series of physiological changes in the body. These changes include:

1. Increased heart rate: The heart beats faster to pump more blood to the muscles, which prepares the body to either fight or flee.

2. Increased blood pressure: This helps to deliver more oxygen and nutrients to the muscles.

3. Increased blood glucose levels: This provides the body with more energy.

4. Constriction of the blood vessels in the skin: This redirects blood flow away from the extremities to the muscles that are needed for fighting or fleeing.

5. Dilation of the pupils: This helps to improve vision and focus.

6. Suppression of the digestive system: This diverts energy away from the digestive system to the muscles and organs that are needed for survival.

7. Increased sweating: This helps to cool down the body and prevent overheating.

The fight-or-flight response is an important survival mechanism, but it can also have negative effects if it is triggered too frequently or in situations where it is not necessary. Chronic stress, which can be caused by constant activation of the fight-or-flight response, can lead to a variety of health problems, including heart disease, high blood pressure, and digestive issues.