This hypoxia also causes the parasympathetic nerve fibers to die off.

这还会导致副交感神经纤维死亡。

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

这也被称为交感神经系统反应，或战斗/逃跑反应。

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

目前尚不清楚交感神经是否也会让们的头发随年龄变白。

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

这些副交感神经元可以使直肠收缩，并使肛门内括约肌松弛。

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

正常情况下，这些交感神经能扩瞳、提上眼睑，以协助刺激汗腺。

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）含有交感神经，支配头部、颈部与眼。

In both cases, the parasympathetic nerve fibers in the cavernosal spaces release acetylcholine from their nerve endings.

在这两情况下，副交感神经纤维在海绵体间隙通过神经末梢释放乙酰胆碱。

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

交感神经系统由遍布身体的神经组成，包括皮肤。

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的释放，从而激活交感神经系统，引发你的“战或逃”反应。

We have parasympathetic nervous system and our sympathetic nervous system.

们有副交感神经系统和交感神经系统。

One of the two divisions of your autonomic nervous system is called the sympathetic system.

你的自主神经系统的两个部分之一叫做交感神经系统。

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

如果产生的热量足够强烈，身体的副交感神经系统就会被触发，从而产生放松反应。

The Autonomic system consists of the sympathetic and the parasympathetic divisions.

自主神经系统由交感神经和副交感神经两部分组成。

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

好了，Karev 医生，如果们要阻止她脸红就要暴露交感神经结，在哪里？

One of them is dedicated to amping you up and preparing you for activity — that's your sympathetic nervous system.

其中一个专门为你兴奋，让你为活动做好准备——那是你的交感神经系统。

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

副交感神经的作用只是稍微抑制威胁反应。

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

然后神经递质提醒交感神经系统感知到的威胁。

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，就会向脊髓内的副交感神经元发出信号，启动排便反射。

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

它是们交感神经系统的一部分， 所以们会呼吸。

We'll start that next week, with a white-knuckle ride through your sympathetic nervous system.

下周们将开始先体验一下你交感神经系统的紧张刺激。