But because it's not adenosine, the" sleepiness" effect isn't felt.

但是，由于咖啡因不是苷，所以再怎么积聚你都不会感觉到有睡意。

Adenosine is found all over your body.

苷酸存在于你身体各个角落。

Caffeine works by interfering with a molecule called adenosine.

咖啡因通过干扰一种叫做苷酸分子来产生效果。

Caffeine is a pro at mimicking a neurotransmitter called adenosine.

咖啡因是一种能够像“苷”神经递质一样在神经细胞间传递信息。

In fact, caffeine works by blocking adenosine's receptor pathways.

事实上，咖啡因是靠阻断接受苷感知器官来实现其作用。

Adenosine can no longer bind, meaning it's calming properties are diminished.

苷无法再与受体连接，意味着它镇静作用就会减弱。

Firstly, caffeine blocks the receptors in the body for a compound called adenosine.

首先，咖啡因会阻断体内对苷化合物受体。

Throughout the day, your brain has been releasing a waste product called adenosine.

一整天，你大脑都在释放废物，就是苷。

There are four bases: adenosine, thymine, cytosin, and guanine.

苷、啶、胞啶和鸟嘌呤。

We gave him 40 of furosemide. Rhythm didn't change after 6 of adenosine.

我们给他注射40个单位利尿剂。在注射了6个单位瞟呤核甘后心律不变。

No, no, no, it only stops your heart for six seconds...-Meredith, it's adenosine.

不，不，不，这个只会停住你心跳6秒... -Meredith，是苷。

Caffeine blocks adenosine from binding to receptors, which can give you a boost of energy.

咖啡因阻止了苷和受体结合，让你短暂得到能量。

The more adenosine latching onto receptors in your brain, the more tired and inattentive you become.

越多苷附着在你大脑受体上，你就越感到疲乏和无法集中注意力。

Whenever you're awake, a chemical called adenosine slowly accumulates in your brain.

当你清醒时，一种叫苷化学激素慢慢在大脑累积。

So the caffeine doesn't even need to compete with the adenosine to fit into those receptors.

所以咖啡因不用和嘌呤核苷竞争受体。

As adenosine builds up, it increases the urge to sleep, also known as sleep pressure.

当苷累积起来时候，它增加了困倦感，也就是睡眠压力。

Caffeine molecules interfere with this process, keeping adenosine from doing its job – and keeping us feeling alert.

咖啡因分子会干扰这一过程，阻止苷发挥作用，让我们保持警觉。

Adenosine builds up during the day, gradually reduces our alertness, and eventually makes us feel tired.

苷在白天积累，逐渐降低我们警觉性，最终让我们感到疲倦。

And 6 hours after that, you'll have 37.5mg, leaving more room for adenosine to jump back into action.

在这之后6小时里，将会剩余37.5毫克咖啡因，留下更多空间让苷得以重新行动。

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

所以说咖啡因抑制了苷酸执行它职责，然而那些兴奋神经传导物质依然在周围。