You see a rattlesnake and notice an increase in your heart rate, a dry mouth, sweating and general trembling. Your bodily reactions are due to the:

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Quizplus · Accepted Answer

The bodily reactions described, such as an increase in heart rate, sweating, and trembling, are all part of the sympathetic nervous system's response to a perceived threat or stressor. The sympathetic nervous system is responsible for the "fight or flight" response and prepares the body to respond to a potential danger, such as encountering a rattlesnake.

You See a Rattlesnake and Notice an Increase in Your