At any given time, up to 25% of the body's blood is circulating through the dermis, making this process extremely efficient.

在何时间，超过25%的身体血液通过皮循环。这使得调节体温这个过程非常有效。

Which two layers make up the dermis?

哪两层构成皮？

That proboscis though keeps going into the dermis, since the epidermis just gets oxygen from the air and doesn't have its own blood supply, whereas the dermis does, and this is what our mosquito's after, right, the blood meal.

但蚊子的喙一直刺入皮，因为表皮只是从空气中获取氧气，皮有血液供应；这就是蚊子的目标：血液大餐。

Then it forms dense irregular tissue, whose fibers are thicker and arranged erratically — it's found wherever tension might be exerted in lots of different directions, like the leathery dermis underlying your skin.

然后它形成致密的规则组织，这些组织的纤维更厚，排列规则——何可能向同方向施加张力的地方都能找到它，比如皮肤下面的皮革皮。

And that includes molecules in the dermis like elastin and collagen, creating tangled clumps or breaking them down.

而这些分子又包括皮中的弹性蛋原一类的物质，造成结束或分解。

You can expect even more damage to the lower layer of your skin, AKA the dermis.

你的皮肤下层，也就是皮层，可能会受到更多的损伤。

With this test, tuberculin is injected between layers of the dermis.

在这个试验中，结核菌素注射于两层皮之间。

These microbes, which include bacteria and fungi, thrive in the sebum, an oily substance that's secreted onto the skin's surface by sebaceous glands nestled inside the dermis.

包括细菌菌的这些微生物，在皮脂内十分活跃，也就是由紧贴在皮内的皮脂腺分泌到皮肤表面的油性物质。

Say you're in the room where you're, like, practicing thumb calisthenics — which probably isn't a thing — but the room is a little chilly, so the blood feeding your dermis loses a lot of heat to that cold air.

假设你在一个房间里，在练习拇指健美操——这可能是个事儿——但是房间有点冷，所以供给你皮的血液在冷空气中损失了很多热量。

With less structural support from the dermis, your skin starts to look thinner and build up wrinkles.

你的皮肤也因皮层功能的衰退显得更薄，并且产生皱纹。

Made up of three layers, the epidermis, dermis, and hypodermis, skin's thickness varies from 0.5 millimeters at its thinnest and up to four millimeters at its thickest.

表皮层，皮层皮下组织。皮肤最薄处为0.5mm，最厚处为4mm。

The epidermis is supported by the dermis, which is where you'll find nerve endings, sweat glands, hair follicles, and connective tissue.

表皮由皮层支撑，在皮层中有神经末梢、汗腺、毛囊结缔组织。

As these cells travel through the lymphatic system, some of them are carried back with a belly full of dye into the lymph nodes while others remain in the dermis.

当这些细胞在淋巴系统中运动，有一部分携带着大量颜料进入淋巴结，另外一些依然留在表皮之下。

So retinoids can help maintain the structure of your dermis and fight off wrinkles by making your body produce more collagen, elastin, and GAGs.

类维生素 A 能促使身体产生更多原、弹性蛋糖胺聚糖，从而有助于保护皮结构，抵抗皱纹。

The needles punch through the epidermis, allowing ink to seep deep into the dermis, which is composed of collagen fibers, nerves, glands, blood vessels and more.

针刺透表皮让颜料深入皮，皮之下是原纤维、神经、腺体、血管等等。

Some of the ink particles are also suspended in the gel-like matrix of the dermis, while others are engulfed by dermal cells called fibroblasts.

有些颜料颗粒悬浮在质的皮结构中，而其它颜料颗粒被叫做成纤维细胞的皮细胞吞噬。

The next layer underneath the epidermis is the dermis.

表皮下方的下一层次是皮。

Even worse, that fire causes damage to the dermis, the tissue below the skin.

更糟糕的是， 火灾会损坏皮， 皮肤下的组织。

Generally taken from the dermis of the skin.

一般取自皮肤皮层。

The vessels and capillaries are at the level of the dermis.

血管毛细血管位于皮层。