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B1 中级 英语 4:20 Educational

What makes muscles grow? - Jeffrey Siegel

TED-Ed · 23,226,731 次观看 · 添加于 2 天前

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B1

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字幕 (73 片段)

00:06

Muscles.

00:08

We have over 600 of them.

00:10

They make up between 1/3 and 1/2 of our body weight,

00:14

and along with connective tissue,

00:16

they bind us together, hold us up, and help us move.

00:20

And whether or not body building is your hobby,

00:22

muscles need your constant attention

00:25

because the way you treat them on a daily basis

00:27

determines whether they will wither or grow.

00:31

Say you're standing in front of a door, ready to pull it open.

00:34

Your brain and muscles are perfectly poised to help you achieve this goal.

00:39

First, your brain sends a signal to motor neurons inside your arm.

00:43

When they receive this message, they fire,

00:45

causing muscles to contract and relax,

00:49

which pull on the bones in your arm and generate the needed movement.

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