The second aspect of romantic love is attraction, influenced by a neurotransmitter called dopamine.

浪漫爱情的第二个方面是吸引力，它受到一叫做多巴胺的递质的影响。

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的；色氨酸是合成递质血清素所必须的。

When these three neurotransmitters are in deficit, people become depressed.

当缺乏这三传素时，一个人就变得抑郁。

You've probably heard about the neurotransmitter serotonin being associated with happiness.

你可能听说过血清素与幸福感的产生有关。

This is attributed to the overabundance of a neurotransmitter called dopamine.

这是于存在过多的递质多巴胺的。

But by blocking neurotransmitters released by interneurons, tetanus toxin causes uncontrollable muscle contractions and spasms.

但破伤风毒素通过阻断中间元释放的递质，不受控的肌肉收缩痉挛。

Serotonin is one of the oldest neurotransmitters.

“血清素是最古老的递质之一。”

And without this neurotransmitter, mosquitoes become much worse at learning to avoid danger.

失去这递质以后，蚊子学习躲避危险的能力被大大削弱。

That learning, the researchers found, is made possible by the neurotransmitter dopamine.

研究人员发现，这学习通过递质多巴胺来实现。

It's a neurotransmitter that helps promote feelings of attraction, excitement, and giddiness.

它是一递质，有助于促进吸引、兴奋和头晕的感觉。

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。

So caffeine stops adenosine from doing its thing, while some stimulating neurotransmitters are still around.

所以说咖啡因抑制了腺苷酸执行它的职责，然而那些兴奋的传物质依然在周围。

Caffeine is a pro at mimicking a neurotransmitter called adenosine.

咖啡因是一能够像“腺苷”递质一样在细胞间传递信息。

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

提供缓解的化学物质之一是血清素，一递质。

When this pathway activates, the neurotransmitter starts a chain reaction.

当这一途径激活时，递质开始连锁反应。

These cannabonoids are specialized neurotransmitters released by neurons having just fired.

这些大麻素是一直处于信息发送状态的元释放的特化递质。

While dopamine and endorphin delight us, the other neurotransmitters send information from A to B.

当多巴胺和内啡肽让我们兴奋时，其他递质将信息从 A 传递到 B。

Pleasurable experiences flush certain parts of our brain with dopamine, a neurotransmitter.

愉快的历使我们大脑的某些部分充满了多巴胺（一递质）。

Our motivation levels are affected by dopamine, a hormone and neurotransmitter.

我们的动力水平受到多巴胺的影响，多巴胺是一激素和递质。

Tyrosine is then turned into neurotransmitters important for normal brain development and function.

酪氨酸接着被转化成对大脑正常的发育和功能都很重要的递质。