Which of the following is an example of a physiologic response to negative stress?

The example of a physiologic response to negative stress is an upset stomach. This symptom occurs as a result of the body's stress response, which can cause a variety of gastrointestinal issues. When an individual experiences negative stress, the body enters a state of heightened alertness and readiness to respond, often referred to as the "fight or flight" response. This reaction can lead to increased stomach acid production or changes in digestion, resulting in physical symptoms such as an upset stomach.

In contrast, options such as increased alertness, improved focus, and heightened resilience are generally associated with positive stress responses or coping mechanisms. While they can occur in stressful situations, they represent more adaptive responses rather than direct physiological reactions that typically arise from negative stress, such as gastrointestinal disturbances. Thus, the upset stomach is a clear example of how negative stress manifests physiologically in the body.