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、去甲肾上腺素所必须；色氨酸是合成递质素所必须。

Serotonin is one of the oldest neurotransmitters.

“素是最古老递质之一。”

Specifically, the genes that express your serotonin receptors.

更准确地说，是表达素受体基因。

One of those relief-providing chemicals is serotonin, a neurotransmitter.

提供缓解化学物质之一是素，一递质。

Patients with schizophrenia often have elevated levels of serotonin in the brain.

患有精裂症病人大脑通常拥有较高素水平。

One widespread impression among the public is that depression is caused by having too little serotonin.

公众普遍认为抑郁症是由素过少而引起。

Because MDMA affects serotonin, a nervous system chemical.

这是因为MDMA会影响一名为“素”系统化学物质。

And finally, higher levels of serotonin are associated with greater confidence.

最后，素水平越高，越能加强自信。

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

首先，它能优化递质水平，如素、去甲肾上腺素和多巴胺。

First off, serotonin isn't the only neurotransmitter that plays a role.

首先，5-羟色胺不是唯一起作用递质。

You've probably heard of a couple of these neurotransmitters—serotonin and norepinephrine.

或许你可能听过几递质介质——5-羟色胺与降肾上腺素。

Is it Cortisol, testosterone, insulin or serotonin. You've got three seconds, go!

是皮质醇、睾丸素、胰岛素还是素？你有3秒钟时间，开始！

Well, exercise releases an important blend of mood altering hormones including dopamine, serotonin and norepinephrine.

通过锻炼，人体会释放一些重要情绪调节激素，包括多巴胺、素和降肾上腺素。

It contains tryptophan, a chemical in the brain that is used to produce serotonin.

它含有色氨酸，即一在大脑中用来产生素化学物质。

They lose their sensitivity to serotonin and norepinephrine. Which leads to...? Impaired cognitive function.

会失去对5 羟色胺和正肾上腺素敏感性 那就会引起认知功能受损。

Once it hits your bloodstream, it targets three major neurotransmitters — serotonin, dopamine, and norepinephrine.

一旦它进入你液，它就会瞄准三主要递质——素、多巴胺和去甲肾上腺素。

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，锻炼还能提高体内去甲肾上腺素以及 5-羟色胺水平。

The other looks at how a brain chemical called serotonin regulates the patience of rats.

而另一个则是研究大脑中一叫素化学物质如何调整老鼠耐受力。

But that serotonin also makes it easier for the itch signal to be re-triggered again.

但是素也使得瘙痒信号更容易再次被触发。

What happens is your serotonin levels are down and melatonin which makes you sleepy, that's up.

于是素水平下降，褪黑素上升，让你犯困。