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

在每个分支的有一个叫做肺泡的小。

Because alveoli serve as critical exchange points between the blood and air from the outside world, they have their own specialized types of white blood cells, or macrophages, which defend against foreign organisms by enveloping and eating them.

因为肺泡相当于液和来自体外的空之间的一个临界交换点，它们拥有专门的白细胞，又名巨噬细胞，这种细胞通过包络和吞噬外来细胞来进行防御。

The first part is the root, and it sits within the alveolus.

第一部分是牙根，位于牙槽骨内。

Gas exchange in the lungs, so oxygen moving from the alveoli into the blood and carbon dioxide from the blood into the alveoli are both great examples of diffusion.

肺部进行体交换，因此氧从肺泡进入液和二氧化碳从液进入肺泡是扩散的很好的例子。

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

肺泡是微小的，看起来像小丛葡萄，包裹于毛细管网。

Both of your lungs contain about 700 million alveoli, which together provide an amazing 75 square meters of moist membrane surface area.

你的两个肺包含大约 7 亿肺泡，它们共同提供了惊人的 75 平方米的湿膜表面积。

They represent tiny air-sacs or alveoli getting filled with fluid, and turning a shade of grey on a CT scan.

这代表着肺泡充满液体，从而在CT显像呈现灰色阴影。

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

这个问题出现在肺部深处，叫做肺泡的微小，肺泡是将二氧化碳转化为氧的部位。

If enough fluid fills some of these capillaries in the lungs, they can rupture, leaking blood into the alveoli.

一旦足量积液充斥着肺部毛细管，可能会出现破溃，液渗出进入肺泡。

When the lungs are affected, the toxins damage the alveolar-capillary membranes, which can result in bleeding within the alveoli.

肺部受累时，细菌毒素会破坏肺泡毛细管内膜，从而导致肺泡内出。

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

移出异物后，肺泡的空周围围绕的大多是I型肺泡细胞。

Eventually the respiratory bronchioles ends when there are nothing but alveoli, and at that point the airway is called an alveolar duct rather than a respiratory bronchiole.

最终呼吸性细支管结束于肺泡，此时道被称为肺泡管，而不是呼吸性细支管。

The body also tries to force the fluid out of the alveoli through coughing.

身体也试图通过咳嗽，使那些液体脱离肺泡。

As alveoli are responsible for gas exchange, this is not good news.

由于肺泡负责体交换，这可不是好消息。

Preemies' lungs haven't yet developed enough of these surfactants, so the small alveoli squeeze too much and collapse, while the larger ones keep blowing up and get distended.

早产儿的肺还没有生长出足够的表面活性剂，所以小的肺泡因挤压出太多的体而塌陷，而大的肺泡则不断膨胀。

Both bones have an alveolus, or socket, for each tooth.

它们富有凹槽即牙槽，以放置牙齿。

This leads to fluid exudation and deposition of fibrin in the alveoli, resulting in a destructive pneumonia that obliterates the air spaces and compromise respiratory function.

这会引起肺泡液体渗出、纤维蛋白沉积，导致破坏性肺炎，使腔消失，损害呼吸功能。

Because that's because each sac contains a cluster of alveoli, these tiny cavities lined with super thin, wet membranes made of simple squamous epithelium tissue.

因为这是因为每个包含一簇肺泡，这些微小的空腔内衬着由简单鳞状上皮组织制成的超薄湿膜。

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

然后填充肺泡，微小的空能使氧和二氧化碳在肺部和液之间交换。

The immune system releases additional white blood cells in the alveoli to help.

免疫系统也会在肺泡释放出更多的白细胞去帮忙。