This one's called norepinephrine. And it is always norepinephrine that's released from postganglionic fibers in the sympathetic nervous system.

这个叫做去甲素。交感神经系统节后纤维释放的永远是去甲素。

This is because the nicotine in cigarettes released epinephrine and norepinephrine, which increase your heart rate and narrowed blood vessels.

这是因为烟草中的尼古丁会释放素去甲素。

When you fall asleep though, your norepinephrine levels drop.

当你入睡时，去甲素水平会下降。

Your adrenal gland releases the stress hormones cortisol, epinephrine, also known as adrenaline, and norepinephrine.

你的会释放压力荷尔蒙皮质醇，素，以去甲素。

Norepinephrine is always present at some level while you're awake.

你在清醒时，去甲素总保持在一定程度。

It will immediately increase noradrenaline in the body to activate our fight and flight system.

它会立即增加体内的去甲素，以激活我们的战跑系统。

We will have a huge increase by 2.5-fold of noradrenaline within a few minutes.

我们会在几分钟内大量增加 2.5 倍的去甲素。

Norepinephrine is another neurotransmitter involved in attention and arousal.

去甲素是与注意觉醒相关的另一种神经递质。

Whether you're awake or asleep, norepinephrine helps you remember things.

无论清醒状态下还是睡着了，去甲素都能帮助人们记住各种事情。

The body compensates by increasing its number of noradrenaline receptors so it can detect much smaller amounts of noradrenaline.

为了对抗这种变化，人体会增加去甲素受体的数量，以便能侦测到更低浓度的 去甲素。

The sympathetic neurons releases norepinephrine, also called noradrenaline, and the cells of the adrenal medulla release norepinephrine and epinephrine, also called adrenaline.

交感神经元释放去甲素，而髓质细胞释放去甲素与素。

First, it optimizes the levels of neurotransmitters like serotonin, norepinephrine, and dopamine.

首先，它能优化神经递质水平，如血清素、去甲素多巴胺。

Some research has found that there is a loss of noradrenaline neurons in the brain in Parkinson's patients.

有研究发现，帕金森患者的脑内缺少“去甲素神经元”。

Norepinephrine has substantial effects on focus, attention, vigilance and it improves mood.

去甲素对人的专注度、注意力警觉性都有显著影响，而且可以改善情绪。

Noradrenaline is another component in making you anxious.

去甲素是另-种会使你感到焦虑的成分。

And disturbances in norepinephrine transmission is thought to also be a key component in depression.

去甲素传递的紊乱也被认为是抑郁症的关键诱因。

So, the preganglionic fiber releases ACh, and the postganglionic releases norepinephrine.

所以节前神经纤维释放 ACh，节后神经纤维释放去甲素。

Aside from its positive effects on dopamine, exercise also elevates levels of norepinephrine and serotonin.

除了可以增加多巴胺外，锻炼还能提高体内的去甲素以 5-羟色胺水平。

And Noradrenaline is also the hormone that kickstarts the fight or flight response.

去甲素也是启动战或跑反应的激素。

Tyrosine is needed to synthesize dopamine and norepinephrine, and tryptophan is needed to synthesize the neurotransmitter serotonin.

酪氨酸是合成多巴胺、去甲素所必须的；色氨酸是合成神经递质血清素所必须的。