Which of the following describes a physiological change that occurs during the "fight or flight" response?

During the "fight or flight" response, the body undergoes several physiological changes to prepare for a perceived threat or emergency. One of the hallmark features of this response is the elevation of blood glucose levels. This occurs due to the release of stress hormones, such as adrenaline (epinephrine) and cortisol, which stimulate the liver to convert glycogen into glucose and release it into the bloodstream. This increase in available glucose provides the necessary energy for muscles and the brain, which is essential for quick, decisive action in response to stress.

The other options reflect physiological changes that do not occur during this response. Enhanced digestive functions are typically reduced as blood flow is redirected to the muscles and vital organs needed for immediate survival. Reduced alertness contradicts the heightened state of awareness that accompanies the fight or flight response, which is designed to increase vigilance. Lastly, increased feelings of relaxation are also contrary to this response, as the body is in a heightened state of arousal and readiness rather than relaxation.