Joe was hiking, and a rattlesnake in the path surprised him. his nervous system was put into action as his heart accelerated, sweating increased, and pupils dilated.

The sympathetic nervous system was put into action. This system  prepares us for action . This is the system that mediates the hormonal stress response. The fighting and flight behaviors are mediated by the sympathetic system. It increases the frequency of heart beats, dilates the bronchi and pupils. Stimulates the adrenal glands The excessive sweating or hyperhidrosis hands, arms or face is associated with a hyper stimulation of the sympathetic system.

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