Final answer:
The flight or fight response is a physiological response that prepares the body to either fight or flee from a perceived danger. Blood moves into the muscles, oxygen levels in the body increase, and breathing becomes faster.
Step-by-step explanation:
The flight or fight response is a physiological response that occurs when the body perceives a threat or a life-or-death situation. During this response, blood moves into the muscles, oxygen levels in the body increase, and breathing becomes faster. This prepares the body to either fight or flee from the perceived danger. The response is mediated by the autonomic nervous system, which releases adrenaline and triggers various physiological changes in the body.