Shawna is skydiving for the first time. When she jumps out of the plane, she feels intense arousal and fear, which are activated by the ; when she lands safely, she calms down and feels a sense of relief, which is produced by the .

sympathetic divison; parasympathetic divison

Explanation: The sympathetic division is the sympathetic nervous system which is a part of the autonomic nervous system that is responsible for raising blood pressure and heart rate, constricts blood vessels and dilates pupils when under stress.

The parasympathetic division is the parasympathetic nervous system which is part of the autonomic nervous system responsible for the  slowing of heart rate and relaxing of muscles.

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