At the end of each branch is a tiny air sac called an alveolus.

在每个分支的末端都有个叫做泡的小气囊。

Emphysema is when the tiny structures in your lungs called alveoli, break down.

气肿是指被称为泡的微小结构破裂。

Initially, doctors had no way to alter the stretchability or squeeziness of their patients' air sacs.

最初，医生没有办法改病人泡的拉伸性或挤压力度。

When this fluid builds up, it makes gas exchange inside the alveoli much more difficult.

当这些液体积聚起来后，就会使泡内的空气转换更加困难。

Free from particles, the inhaled air is now in the alveolus surrounded by mostly type I pneumocytes.

移出异物后，泡的空气周围围绕的大多是I型泡细胞。

That problem happens deep in the lungs, in tiny air sacs called alveoli, which exchange carbon dioxide for oxygen.

这个问题出现在部深处，叫做泡的微小气囊，泡是将二氧化碳转化为氧气的部位。

Zooming out a bit and looking at the acinus, which is a bunch of alveoli, it just turns into one big cavity.

我们把镜头拉远点，看看腺泡，也就是束泡的集合体；这时腺泡会个大囊腔。

And if there's one thing your body hates, it's a bunch of exotic material spicing up your sensitive alveoli!

如果有你身体讨厌的东西进来的话，就是堆有毒的东西让你的泡激动起来了！

This blood absorbs oxygen from the inflated alveoli and leaves behind carbon dioxide.

这种血液从膨胀的泡吸收氧气并留下二氧化碳。

In atypical or interstitial pneumonia, the infection is mainly just outside the alveoli in the interstitium.

在非典型炎和间质性炎，感染主要发生在间质的泡外。

The respiratory system takes in oxygen from the air and expels carbon dioxide and water vapor.

空气进口和鼻，穿过喉咙和气管。气管发出左右分支分别进两，之后以超过20次的分支形大量的泡。

On the other side of the pneumocytes are endothelial cells that line the capillary walls, which is what holds the blood.

而泡细胞的另边就是毛细血管壁的内皮细胞，毛细血管携带的便是我们亲爱的血液。

The respiratory membrane separates the alveolar air on one side from the blood on the other.

呼吸膜将侧的泡空气与另侧的血液分离。

Now, the total surface area of alveoli is about 140 square meters or 1,500 square feet.

现在，泡的总表面积约为140平方米或1500平方英尺。

Another helpful comparison for the arrangement of alveoli are clusters of grapes, where a single alveolus is like an individual grape.

另个关于泡排列的有用比喻是多串葡萄，每个泡就像个葡萄个体。

The smallest of the bronchial branches are called bronchioles. At the end of the bronchioles are clusters of air sacs called alveoli.

最小的支气管分支称为细支气管。在细支气管末端是称为泡的气囊簇。

It then fills the alveoli, tiny air sacs that enable the exchange of oxygen and carbon dioxide between the lungs and blood.

然后填充泡，微小的空气囊能使氧气和二氧化碳在部和血液之间交换。

The alveoli are tiny air sacs that look like tiny clumps of grapes, that are wrapped up in a net of capillaries.

泡是微小的气囊，看起来像小丛葡萄，包裹于毛细血管网。

This large number of alveoli greatly increases the surface area for gas exchange.

大量的泡大大增加了气体交换的表面积。

The partial pressure of oxygen is 100 mmHg in alveolar air compared to only 40 mmHg in the blood entering the lungs.

泡空气的氧分压为100 mmHg，而进部的血液只有40 mmHg。