Our muscle, nervous, and epithelial tissue types are more uniform, more obviously grouped together.

我们的肌肉、神经和上皮组织类型更均匀，更明显地组合在一起。

And all of your epithelial tissues are avascular — meaning they don't have a blood supply.

你所有的上皮组织都是无血管的，这意味着它们没有血液供应。

Which brings me to the other trait that we use to classify epithelial tissue — its layering.

这让我想到了我们用来分类上皮组织的另一个特征——它的分层。

Without epithelial tissue, you'd essentially be a mushy pile of unarticulated goo.

如果没有上皮组织，你基本上就是一堆无法连接的粘液。

Of course, when we talk about epithelial tissue protecting you, it's not always protecting you from the outside world.

当然，当我们谈论上皮组织保护你时，它并不总是保护你免受外界的伤害。

When we talk about your epithelial tissue we're really talking about two things.

当我们谈论你的上皮组织时，我们实际上在谈论两件事。

Today you learned how your unsung epithelial tissue creates the inner and outer boundaries that keep you alive.

今天你们学到了无名的上皮组织是如何创造内部和外部边界，让你们活着的。

Epithelial tissue covers both the inside and the outside of that you-tube.

上皮组织覆盖了管子的内部和外部。

They theorised that, in the absence of worms, the inflamed epithelial tissues in normal mice might instead identify the egg-white protein as an intruder.

他们推测，在没有蠕虫的情况下，正常小白鼠体内发炎的上皮组织可能会将蛋清蛋白识别为入侵者。

And that is where your unsung epithelial tissue steps in, like a burly gym teacher with a whistle and plan.

这就是你默默无闻的上皮组织介入的地方，就像一个身材魁梧的体育老师，吹着口哨，做着计划。

Not only that, but whole deal is lined with epithelial tissue that has more folds than an origami octopus.

不仅如此，它整个都布满了上皮组织，比折纸章鱼有更多的褶皱。

Areolar tissue is the most common loose connective tissue you have, found ALL over your body, just under your epithelial tissue, and wrapped around your organs.

疏松结缔组织（也叫蜂窝组织）是你最常见的松散结缔组织，遍布全身，就在你的上皮组织下面，包裹在你的器官周围。

Those squamous cells are a dime a dozen. There's still lots of layers left. Plus, epithelial tissue regenerates really quickly.

那些鳞状细胞可以说是一打一毛钱。还有很多层。另外，上皮组织再生非常快。

When you put the shape of a cell together with its type of layering, you can begin to see how both traits inform the function of your epithelial tissue.

当你将细胞的形状及其分层类型放在一起时，可以开始看到这两种特征是如何通知上皮组织的功能的。

Remember: Your glands are also made up largely of epithelial tissue, so it ALSO plays a big role in facilitating all of your secretions — from sweat and mucus, to hormones and enzymes.

你的腺体也主要由上皮组织组成，所以它在促进你所有的分泌物方面也起着重要作用——从汗液和粘液，到激素和酶。

We've covered the basic properties of nervous, muscle, and epithelial tissue, but we haven't gotten to the most abundant and diverse of the four tissue types — our connective tissue.

我们已经介绍了神经组织、肌肉组织和上皮组织的基本特性，但我们还没有涉及四种组织类型中最丰富、最多样化的——结缔组织。

To get a better sense of what I mean, take a look at this balloon. The latex is like the outer covering of your body, in part made up of epithelial tissue.

为了更好地理解我的意思，看看这个气球。乳胶就像你身体的外层覆盖物，部分由上皮组织组成。

We looked at how proper epithelial tissue is classified by both layering — simple or stratified — and shape — squamous, cuboidal, or columnar — and how the structure of these tissue types match their function.

我们研究了上皮组织如何通过分层（简单或分层）和形状（鳞状、立方体或柱状）进行分类，以及这些组织类型的结构如何与其功能相匹配。

So, hey the system works. And it's due in large part to the humorless gym teacher that is your epithelial tissue. It may not always be a ton of fun, but darn it, it gets results.

所以，嘿，这个系统起作用了。这在很大程度上要归功于你的上皮组织——毫无幽默感的体育老师。这可能并不总是一帆风顺，但该死的，它会得到结果。

We also talked about how epithelial cells are polar, having both apical and basal sides, and are selectively permeable, and lastly we took a brief look at how our glandular epithelial tissue forms both out endocrine and exocrine glands.

我们还讨论了上皮细胞是如何极性的，具有顶端和基底两侧，并且具有选择性渗透性，最后我们简要了解了我们的腺上皮组织如何形成内分泌腺和外分泌腺。