Name: 皮膚如何工作 (How Your Skin Works)
Uploaded: 2021-01-14T08:07:26.000Z
Duration: 6 min 29 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

KidsHealth presents "How the Body Works,"

We're going "Under the Surface of the Skin!"

I mean, I see skin all the time-- soft skin, wrinkly skin,

I don't know who gave you your elevator operating license,

but I would like to have a word with them.

Oh Chloe, you don't need a license to operate an elevator.

The epidermis is like a skin cell factory.

New cells are being born at the bottom all the time

and slowly making their way up to the top.

It takes the cells about four weeks to get all the way up,

and by the time they finally make it to the surface,

And you're shedding dead skin cells all the time.

and it's what makes skin darker or lighter.

The more melanin a person has, the darker their skin will be.

I've heard melanin also helps protect you from the sun.

and that's why we wear sunscreen to keep from getting burned.

So what has the dermis done for me lately?

I see blood vessels, and that's a nerve ending over there.

I know nerve endings send messages to the brain,

but what is the skin trying to tell the brain?

OK, I'm going to guess that that terrible pun means

that this has to do with the sense of touch.

Think of all the things your skin touches--

Nerve endings read all of these sensations

and tell the brain and nervous system about them,

So if I touch something too hot, my nervous system

Your skin also detects other touches-- oh, like tickling.

Those are your beautiful, your glorious, your fabulous sweat

They keep you wonderfully sticky and sweaty.

a sticky substance called sebum that moves up

to the epidermis, where it creates an oily layer that

Sebum also makes your skin a little waterproof.

The sweat glands start here in the dermis,

--up to the epidermis, where the sweat comes out of holes called

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皮膚如何工作 (How Your Skin Works)

stuff

fancy

express

substance