What hormone prepares the body for fight or flight?

Adrenaline, also known as epinephrine, is the hormone that prepares the body for the "fight or flight" response. This hormone is released by the adrenal glands in response to stressful or threatening situations. When adrenaline is released, it triggers several physiological changes in the body to prepare for immediate action. These changes include an increase in heart rate, dilation of the airways to improve oxygen intake, and the release of energy stores to provide more fuel for muscles.

This response is critical for survival, allowing an individual to react quickly in dangerous situations. The other hormones mentioned, such as cortisol, insulin, and glucagon, serve different roles in the body. For instance, cortisol is linked to long-term stress responses and metabolism regulation, insulin is crucial for glucose metabolism, and glucagon helps in raising blood sugar levels. However, none of them specifically elicit the immediate physiological changes associated with the fight or flight response like adrenaline does.