What is the term for the way an animal responds when stressed, becoming physiologically aroused in readiness to fight or flee?

The term that describes how an animal responds to stress by becoming physiologically aroused in preparation to either fight or flee is known as the Fight or Flight Response. This concept was first introduced by Walter Cannon in the early 20th century and refers to the body's acute stress response, which involves a series of physiological changes triggered by the release of stress hormones such as adrenaline. When faced with a perceived threat, the body enters a state of heightened alertness, increasing heart rate, dilating airways, and redirecting blood flow to essential muscle groups, enabling the animal to either confront the danger or escape from it.

In this context, the other terms do not specifically capture the essence of this immediate physiological reaction to stress. While "Stress Response" may seem relevant, it is a broader term that can encompass various reactions to stress, not just the acute fight or flight mechanisms. "Homeostasis Response" refers to the body's efforts to maintain stable internal conditions despite external changes, which is distinct from the immediate and active response to a stressor. "Stress Adaptation" involves the longer-term adjustments an organism makes in response to chronic stressors, differing from the immediate fight or flight activation. Thus, the Fight or Flight Response is the specific and accurate label