Ultimately, this is how nutrients, like O2 get pushed out to the organs and tissues that need it; and how wastes, like CO2, or carbon dioxide, which is the main by-product of cellular respiration, gets removed.

在此系统中，营养物质（如氧气）被送到所需的组织中；同时，身体的废物（如二氧化碳，细胞呼吸的主要副品）被移出体外。

When we breathe in, our blood takes oxygen out of the air through our lungs and carries it to our cells where it's used in the process of cellular respiration.

当们吸气时，们的血液通过肺部从空气中吸收氧气，并将其输送到们的细胞中，在那里用于细胞呼吸过程。

Oxygen does play a crucial role in one of the last steps of cellular respiration, but luckily our bodies have alternative pathways that help us survive when we temporarily lack oxygen.

氧气确实在细胞呼吸的最后一个步骤中起着重要的作用，但幸运的是们的身体内存在着交替途径，可以帮助们在临时缺氧的情况下活下来。

Most of us may think of Vitamin C as Citric acid, which is generated during cellular respiration of mammals including humans, but actually, it is not.

们大多数人可能认为维素 C 是柠檬酸，它是包括人类在内的哺乳动物细胞呼吸过程中的，但实际上并非如此。

The first bit of glucose gets delivered throughout the body and is tapped to generate ATP on the spot, through cellular respiration.

第一部分葡萄糖被输送到全身，并通过细胞呼吸当三磷酸腺苷。

Cellular respiration is the process by which chemical energy stored in sugars is converted to energy molecules that fuel life's essential processes.

细胞呼吸是将储存在糖中的化学能转化为为命的基本过程提供燃料的能量分子的过程。

This process of using oxygen to break down sugars into chemical energy is called cellular respiration.

线粒体利用氧气把糖分分解成化学能的过程叫做细胞呼吸。

It's only by working together and using both the bulk flow and simple diffusion of oxygen that they can make possible the process of cellular respiration.

只有通过协同工作，同时利用容积运动氧气的简单扩散，它们才能使细胞呼吸的过程成为可能。

And we can't forget mitochondria, the kidney-bean-shaped sites of cellular respiration in both plant and animal cells.

们也不能忘记线粒体，这是植物动物细胞中肾豆状的细胞呼吸部位。

Cellular respiration occurs in three simultaneous phases, where glucose is broken down by glycolysis and other catabolic reactions; and then turned into pyruvic acid and acetyl CoA; and finally ushered into the Kreb's cycle.

细胞呼吸发在三个同时的阶段，其中葡萄糖被糖酵解其他分解代谢反应分解；然后转化为丙酮酸乙酰辅酶 A；最后进入克雷布循环。

Next time, we'll be seeing these plants in action as they accomplish some of their most important processes: cellular respiration and photosynthesis.

下节课，们将看到这些植物完成一些最重要的过程：细胞呼吸光合作用。

Now, the conversion of food energy is part of the great balancing act that is maintaining homeostasis, and one of its greatest tricks is cellular respiration.

食物能量的转换是维持体内平衡的伟大平衡行为的一部分，它最伟大的技巧之一是细胞呼吸。

For now, just remember that cellular respiration breaks down nutrient molecules to generate ATP.

现在，只要记住细胞呼吸分解营养分子成三磷酸腺苷。

So going back over cellular respiration, where does everything occur?

回到细胞呼吸过程，所有活动发在哪里？

This is going to be cellular respiration.

这就是细胞呼吸。

And when you inhale, your red blood cells grab the O2 from your lungs, and pass it off to your other cells, which use it for cellular respiration -- the process of breaking down sugar to create chemical energy.

当你吸气时，你的红细胞会从肺部抓取氧气， 并将其传递给其他细胞，这些细胞利用它进行细胞呼吸——即分解糖分以化学能量的过程。

So, cellular respiration is like a mini power plant inside your cells that turns food and oxygen into the energy your body needs to work.

因此，细胞呼吸就像是你细胞内的一个小型发电厂，将食物氧气转化为身体运作所需的能量。

A process called cellular respiration consumes glucose and oxygen to form ATP, the energy currency of the cell.

一个名为细胞呼吸的过程会消耗葡萄糖氧气， 以成ATP，即细胞的能量通货。

Meanwhile other carbohydrates, the ones that are used to produce energy, go through a process called cellular respiration.

与此同时，其他碳水化合物， 即用于能量的碳水化合物，会经历一个称为细胞呼吸的过程。

As we've just discussed, cellular respiration is how cells get energy from food.

正如们刚刚讨论的，细胞呼吸是细胞如何从食物中获取能量的过程。