Bipolar disorders also heighten the activity of the sympathetic nervous system, which sets off the fight-or-flight response to stress.

双相情感障碍也加强了交感神经系统的活动性，它对压力做出战斗-逃跑的反应。

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The finding also shows that the brain could increase the activity of the sympathetic nerves, the part of the nervous system involved in stress response.

这些发现也显示，大脑能增加交感神经的活动，而交感神经是负责压力响应的神经系统。

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Sleep deprivation also led to an increase in the activity of the sympathetic nervous system, which controls many of the body's "involuntary" functions.

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Beta blockers work by reducing activity in the sympathetic nervous system, which is one of the two major branches of the body's stress (or fight-and-flight) system.

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