Final answer:
The body's fight-or-flight response is triggered by excessive stress, preparing it to either fight or flee for survival.
Explanation:
Fight or Flight Response
When we experience excessive stress, either from internal worry or external circumstance, a bodily reaction called the "fight-or-flight" response will be triggered. This response system represents the genetic impulse to protect ourselves from bodily harm, but also can result in negative health effects. According to Cannon's theory, during stress-response processes, the sympathetic nervous system increases the heart rate and releases chemicals to prepare our body to either fight or flee.
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