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，或战斗/。

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

当这种情况发生时，我们的交感神经系统会触发战斗或。

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我们的头发随年龄变白。

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

这种缺氧还会导致副交感神经纤维死亡。

That is where your sympathetic system's more mellow half-brother, the parasympathetic system comes in.

这就是你的交感神经系统成熟的同父异母兄弟——副交感神经系统的用武之地。

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。

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。

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”。

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

在这两种情况下，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。

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，以及协助刺激汗腺。

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

下周我们将开始先体验一下你交感神经系统的紧张刺激。

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。

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，启动排便射。

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。

Damaged parasympathetic nerve fibers can't release acetylcholine, so there's less nitric oxide synthase activation, and less nitric oxide is produced.

受损的副交感神经纤维不能释放乙酰胆碱，因此被激活的一氧化氮合酶较少，产生的一氧化氮也较少。

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

同时，交感神经纤维，从第一胸髓神经根或T1发出，支配你的头、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 医生，如果我们要阻止她脸红就要暴露交感神经结，在哪里？

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。

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

它是我们交感神经系统的一部分， 所以我们会呼吸。

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

然后神经递质提醒交感神经系统感知到的威胁。