In which stage of the general adaptation syndrome does the body experience heightened alertness?

The body experiences heightened alertness during the alarm stage of the general adaptation syndrome. This stage is initiated in response to a stressor, triggering the body's fight-or-flight response. In this phase, the body prepares itself to confront or escape the threat, leading to increased heart rate, elevated blood pressure, and heightened awareness. These physiological changes are essential for enhancing physical performance and focus in times of stress.

The alarm stage sets the foundation for the subsequent responses to stress. It is characterized by the activation of the sympathetic nervous system and the secretion of stress hormones like adrenaline, which further amplify these responses. Understanding this stage is crucial in recognizing how the body initially reacts to stress and how it can affect performance in various situations.