This is otherwise known as a sympathetic nervous system response, or the fight-or-flight reflex.

这也被称为感神经系统反应，或战斗/逃跑反应。

When this happens, our sympathetic nervous system triggers a fight-or-flight response.

当这种情况发时，我们感神经系统会触发战斗或逃跑反应。

It's unclear whether the same sympathetic nerves make us gray as we age.

目前尚不清楚感神经是否也会让我们头发随年龄变白。

The HPA Axis is essentially the endocrine system's companion to the sympathetic nervous system.

HPA 轴本质上是内分泌系统感神经系统。

Finally the first thoracic nerve root or T1 provides sympathetic innervation for the head, neck, and eyes.

最后，第一条胸神经根（T1）含有感神经，支配头部、颈部眼。

These parasympathetic neurons make the rectum contract and the internal anal sphincter relax.

这些副感神经元可以使直肠收缩，并使肛门内括约肌松弛。

Adderall also causes the release of norepinephrine, which activates the sympathetic nervous system, initiating your fight-or-flight response.

Adderall 还会导致去甲肾上腺素释放，从而激活感神经系统，引发你“战或逃”反应。

Normally, these sympathetic nerves help to dilate the pupil, raise the eyelid, and help stimulate the sweat glands.

正常情况下，这些感神经能扩瞳、提上眼睑，以及协助刺激汗腺。

If the heat generated is intense enough, the body's parasympathetic nervous system is triggered, which creates a relaxation response.

如果产热量足够强烈，身体副感神经系统就会被触发，从而产放松反应。

So, this is where I tell you that you're lucky to have a sympathetic nervous system.

所以，这就是我告诉你——你有感神经系统很幸运。

So the parasympathetic system is why our hearts don't pump so hard that they explode, sure.

所以副感神经系统是为什么我们心脏不会用力跳动到爆炸原因，这是当然。

Once the rectum is filled and stretched, signals travel to parasympathetic neurons in the spinal cord, initiating the defecation reflex.

当直肠被粪便填满并受到牵拉时，就会向脊髓内副感神经元发出信号，启动排便反射。

The sympathetic nervous system is made up of a collection of nerves that extend through the body, including the skin.

感神经系统由遍布身体神经组成，包括皮肤。

Now, at the first thoracic nerve root or T1, you've got sympathetic nerves that supply the head, neck and eyes.

同时，感神经纤维，从第一胸髓神经根或T1发出，支配你头、颈和双眼。

Okay, Dr. Karev, if we're gonna stop her blushing, we have to expose the sympathetic ganglion chain which resides where?

好了，Karev 医，如果我们要阻止她脸红就要暴露感神经结，在哪里？

The parasympathetic is coming in to just tamp down the threat response a little bit.

副感神经作用只是稍微抑制威胁反应。

It's part of our sympathetic nervous system, so we'll breathe.

它是我们感神经系统一部分， 所以我们会呼吸。

Neurotransmitters then alert the sympathetic nervous system of the perceived threat.

然后神经递质提醒感神经系统感知到威胁。

Then, the prefrontal cortex takes over from the amygdala and stimulates the parasympathetic nervous system.

然后，前额叶皮层接管杏仁核并刺激副感神经系统。

Emotional distress and other overreactive sympathetic nervous system activities typically trigger insomnia.

情绪困扰和其他过度活跃感神经系统活动通常会引发失眠。