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Which part of the nervous system would increase its activity when a person is startled by a nearby car horn? parasympathetic sympathetic voluntary only involuntary only?

User Pier
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When a person is startled by a nearby car horn, the sympathetic nervous system will increase its activity. This part of the nervous system will activate the person's fight-or-flight response. It will help the person decide whether to fight aggressively or to flee quickly. In this case, it will tell the person to quickly move away from the car. 
User Keatch
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