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While you are waiting to begin a foot race, you can feel your heart rate go up. This is the _____ at work.

A. sympathetic nervous system
B. parasympathetic nervous system
C. endocrine system
D. central nervous system

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Question: While you are waiting to begin a foot race, you can feel your heart rate go up. This is the _____ at work.                                                             Answer: A.) The sympathetic nervous system
syed514
The answer is sympathetic nervous system.

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