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Physiological or biological stress is an organism's response to a stressor such as an environmental condition. Stress is a body's method of reacting to a challenge. According to the stressful event, the body's way to respond to stress is by sympathetic nervous system activation which results in the fight-or-flight response.
Key Takeaways. 1  Stress has been conceived of in different ways: as a response, as a stimulus, and as a transaction. 2  Stress as response treats stress as the physiological dependent variable. 3  Stress as stimulus treats stress as a life event or change that acts as an independent variable.