What is the name of the stage in the human response to a life-threatening situation characterized by physical tension and heightened awareness?

The stage in the human response to a life-threatening situation characterized by physical tension and heightened awareness is known as the alarm stage. This stage is part of the body's acute stress response, commonly referred to as the "fight or flight" response. When faced with a threatening situation, the body reacts by releasing stress hormones like adrenaline, which prepare the individual to either confront or evade the threat.

During this stage, there is an increase in heart rate, blood pressure, and energy supplies, which enhances physical performance and situational awareness. This heightened state can result in increased focus and alertness, allowing individuals to assess and react to the danger more effectively. Understanding this stage is critical for SAR technicians as it helps them recognize the physiological responses in themselves and those they may be assisting in a crisis.