It contains microscopic, fluid-filled tubules that run from the pulp to the underside of the enamel.

它包含微小的、充满液体的小，从牙髓一直到牙釉质下层。

If your enamel is worn away, your dentin and its tubules can be exposed.

如果你的牙釉质被磨掉了，你的牙本质和它的小就会暴露出来。

These tubules are the sperm factories, made of a stratified epithelium surrounding a central fluid-filled lumen.

这些小工厂，由围绕充满液体的中央腔的分层上皮组成。

And this sperm-making work is supported by cells throughout and around the tubules.

这种制造工作由遍布小及其周围的细胞支持的。

Each one is divided into about 250 sections, called lobules, which are loaded with tightly-coiled seminiferous tubules.

每一个都被分成大约 250 个部分，称为小叶，其中装载着紧密盘绕的生小。

ADH affects the last two-thirds of these tubes, called the distal convoluted tubule and the collecting ducts.

ADH作用于这些小的终末2/3部分，即远曲小和集。

Typically intrarenal AKI's due to damage to the tubules, the glomerulus, or the interstitium —the space between tubules.

通常，肾性AKI由于肾小、肾小球或间质空间（肾小间的空间）损坏所致。

Beneath that is the medulla, a set of cone-shaped masses of tissue that secrete urine into tiny sac-like tubules.

髓质下面一组锥形组织，将尿液分到微小的囊状小中。

It's called a cast because it stays in essentially the same cylindrical shape as the tubule.

它被称为型，因为它基本上与小保持相同的圆柱形状。

The targets of the testosterone are the outermost cells in the tubules, called spermatogonia.

睾酮的目标小中最外层的细胞，称为原细胞。

As the filtrate leaves the Bowman's capsule it flows into the renal tubule, which is surrounded by the peritubular capillaries.

滤液离开肾小囊后流入肾小，后者被周毛细血网包围。

But in this case, the sperm develop on the outer edge of the tubule, and progress inward toward the lumen.

但在这种情况下，在小的外缘发育，并向内腔前进。

And this is showing us the digestive tubules of these animals.

这向我们展示了这些动物的消化。

And they also have a circulatory system that wraps around that tubule.

它们还拥有一个环绕该状结构的循环系统。

Things like specific organizational structures are the cells forming gland-like tubules or papillary clusters.

像特定的组织结构，例如形成腺样状结构或乳头状簇状的细胞。

So, let's trace the whole process, starting at the top, with the proximal convoluted tubule or PCT.

所以，让我们追踪整个过程，从顶部开始，用近端卷曲小或 PCT。

Macula densa cells are located in the distal convoluted tubule and they can sense when levels of sodium and chloride are low.

致密斑位于远曲小，可以感受到钠和氯水平降低。

Some substances are removed from blood through the peritubular capillary network into the distal convoluted tubule or collecting duct.

有些物质通过周毛细血网从血液中移出，进入远曲小或集。

Now, obviously, if sperm are going to get anything accomplished, they have to leave the seminiferous tubules that made them.

现在，很明显，如果想要完成任何事情，它们必须离开制造它们的生小。

Hypercalciuria can result from impaired renal tubular reabsorption of calcium, which leaves a lot of calcium behind in the tubule.

高尿钙可因肾小重吸收钙功能不全导致，因此肾小中残存了大量的钙。