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

这种缺氧还会导致交感神经纤维死亡。

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

这些交感神经元可以使直肠收缩，并使肛门内括约肌松弛。

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

这就你交感神经系统更成熟同父异母兄弟——交感神经系统用武之地。

" Point" is erection and it's caused by " P, " or parasympathetic fibers.

“Point”代表勃起，它“P”交感（parasympathetic）神经纤维引起。

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

在这两种情况下，交感神经纤维在海绵间隙通过神经末梢释放乙酰胆碱。

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

保证心脏处于可控部分原因你交感神经系统。

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

而且，交感神经系统情况正好和陪衬相反。

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

如果产生热量足够强烈，身交感神经系统就会被触发，从而产生放松反应。

It mostly falls within the parasympathetic domain of " necessary but not an emergency."

它主要属于“必要但不紧急情况”交感神经域。

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，就会向脊髓内交感神经元发出信号，启动排便反射。

We have parasympathetic nervous system and our sympathetic nervous system.

我们有交感神经系统和交感神经系统。

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

但交感神经系统神经纤维从交感神经上方和下方开始。

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

交感神经作用只稍微抑制威胁反应。

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交感神经系统。

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

自主神经系统交感神经和交感神经两部分组成。

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

这要归功于自主神经系统交感神经分支。

We also see that the parasympathetic nervous system decreases heart rate, which decreases cardiac output.

我们还看到交感神经系统降低了心率，从而降低了心输出量。

And the other one talks you down and effectively undoes what its foil did. And that is the parasympathetic nervous system.

另一个会让你沮丧，有效地解除它衬托所起作用。那交感神经系统。

The second half, that's the exhale, comes from your parasympathetic nervous system, which affects your ability to relax and calm down.

后半部分，呼气，交感神经系统发挥作用，影响放松和平静能力。

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

受损交感神经纤维不能释放乙酰胆碱，因此被激活一氧化氮合酶较少，产生一氧化氮也较少。