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

副交感经的作用只是稍微抑制威胁。

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经系统的紧张刺激。

But the nerve fibers of your parasympathetic system begin both above and below where the sympathetic ones do.

但是副交感经系统的经纤维是从交感经的上方和下方开始的。

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

当这种情况发生时， 我们的交感经系统会引发战斗或逃跑。

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

它是我们交感经系统的一部分， 所以我们会呼吸。

This happens thanks to the parasympathetic division of the autonomic nervous system.

这要归功于自主经系统的副交感经分支。

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，身体的副交感经系统就会被触发，从而产生放松。

And, foils being what they are, the reverse is of course true for the parasympathetic system.

而且，副交感经系统的情况正好和陪衬是相的。

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

一个专门为你兴奋，让你为活动做好准备——那是你的交感经系统。

It stimulates your parasympathetic nervous system, the half of your nervous system responsible for activities like resting and digesting.

它会刺激您的副交感经系统，这是负责休息和消化等活动的经系统的一半。

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经元发出信号，启动排便射。

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。

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与交感经系统的伴侣。

Well, the first half of your breath, the inhale, influences your sympathetic nervous system, which controls your fight or flight response.

呼吸的前半部分，吸气，会影响你的交感经系统，该系统控制战斗或逃跑。

What happens on a physiological level is when our parasympathetic fires up and we slow down, nature comes into sharper focus.

在生理层面上发生的情况是，当我们的副交感经兴奋而我们放慢速度时，自然就会变得更加清晰。

For example, if the tumor is in the thoracic region of the sympathetic chain, it can grow into the lungs, causing breathing difficulties.

例如，若肿瘤位于胸部的交感经链，它会生长到肺，导致呼吸困难。

Tumors on the sympathetic chain might also grow into the spine, causing neurologic symptoms, like muscle weakness or bowel and bladder problems.

交感经链上的肿瘤也有可能生长到脊柱，导致经系统症状，如肌无力或肠道及膀胱问题。

That's your sympathetic nervous system, otherwise known as your fight-or-flight system, kicking in to offer you the energy you need to respond.

那是你的交感经系统， 也就是你的战或逃系统，它会为你提供所需的能量。

Part of what keeps your heart under control is your parasympathetic nervous system.

保证心脏处于可控状态的部分原因是你的副交感经系统。

To recover from a threat, our parasympathetic nervous system can put our body into a rest-and-digest state allowing us to relax and be calm.

为了从威胁恢复过来， 我们的副交感经系统可以让我们的身体进入休息和消化状态， 让我们放松和平静。