日韩色综合-日韩色中色-日韩色在线-日韩色哟哟-国产ts在线视频-国产suv精品一区二区69

手機APP下載

您現在的位置: 首頁 > 英語聽力 > 公開課 > 保健與醫學:循環系統 > 正文

可汗學院《保健與醫學:循環系統》第21期:心跳的聲音(2)

來源:可可英語 編輯:max ?  可可英語APP下載 |  可可官方微信:ikekenet
  


掃描二維碼進行跟讀打分訓練

And the same thing happens on this side.

這里也是一樣的
Let's imagine you have some backwards flow of blood by accident,
假設這里血液出現了逆流
meaning that it's going in the wrong direction.
方向又出錯了
Well, then these valves are going to close down.
這時瓣膜是關閉的
So the white arrows represent the correct flow of blood,
重申一下,白色的方向是正確的
and the black arrows represent the incorrect flow of blood.
黑色的血液流動方向是錯誤的
So these valves shut down like that.
這時瓣膜應該是關閉的
So now you can see how the valves, the aortic and pulmonary valve,
現在大家看到,三尖瓣和二尖瓣打開的時候
are actually closed when the mitral and tricuspid valve are open.
主動脈瓣和肺動脈瓣是關閉的
So what happens after this?
之后又會怎樣呢?
So now our ventricles are full of blood, right?
心室充滿血液之后會怎樣呢?

可汗學院《保健與醫學:循環系統》

They're full of blood.

現在心室充滿血液
And let's say they squeeze down, and they jettison all the blood into those arteries.
假設心室將血液擠壓出去,進入動脈
Well, now you're going to have-- this is actually going to close down.
那么這里瓣膜是關閉的
Let's say this arrow flips around.
假設箭頭轉向
These arrows become white,because the direction of flow is going to be in the direction we want it.
這里箭頭變成白色的了,因為現在方向是正確的
It's going to go this way and this way
流動方向是這樣的
And to allow that, of course, I need to show you that these open up.
那么這里瓣膜要打開
And they allow the blood to go the way that we want it to go,
使血液通過
so now blood is going to flow through those two valves.
現在血液通過主動脈瓣和肺動脈瓣了
But similar to before, you could have some backflow here. Right?
同樣的,這兩個地方血液可能回流
You could have backflow here.
可能出現逆流的情況
And you can have backflow here.
這里也可能出現逆流
So you can imagine now, let's say you have a little bit of backflow that
那么大家看,假設這里血液逆流
wants to go this way, which is the wrong direction.
這樣的流動方向是錯誤的
Right? Well, then these valves are going to close up.
那么瓣膜應該關閉
They're going to say, no, you can't go that way.
瓣膜要阻止血液逆流
They're going to close right up, and they're going to not allow blood to go that way.
這里的瓣膜要關閉,不能讓血液回流
So this is going to happen on both sides, both ventricles.
兩邊的心室都是一樣的情況
And the valves shut.
這時房室之間的瓣膜就關閉了
And so basically the backflow of blood is not allowed, because the valves keep shutting.
瓣膜關閉,這樣血液就不會回流了
And when the valves snap shut-- so for example, right now
瓣膜關閉
the tricuspid valve and the mitral valve snapped shut.
比方說這里,三尖瓣和二尖瓣關閉
Well, that makes a noise.
是有聲音的
So when T and M snap shut, that makes a noise that we call lub.
三尖瓣T和二尖瓣M關閉時,產生的聲音就是前述的“咚”
That's that first noise, that first heart sound.
也就是第一個心音
In fact, sometimes people don't even call it lub dub.
專業形容心跳聲音不會用“咚噠”
They say, well, it's the first heart sound.
而是說,第一個心音
And to make that even shorter, sometimes people call that S1.
為了描述簡便,也叫S1
So if you hear S1, you know they're talking about that same exact thing.
如果有人說S1,你就知道,這是說的第一個心音
And this dub is called the second heart sound.
而“噠”就是第二個心音
And, no surprise, just as before, if that's S1, this is S2.
同理,第一聲是S1,那么這就是S2
So you'll hear S1 when the tricuspid and mitral valve snap shut.
三尖瓣和二尖瓣關閉時,聲音是S1

重點單詞   查看全部解釋    
squeeze [skwi:z]

想一想再看

v. 壓榨,擠壓,塞進
n. 壓榨,勒索,榨取

 
valve [vælv]

想一想再看

n. 瓣膜,閥門,電子管,真空管

聯想記憶
?
發布評論我來說2句

    最新文章

    可可英語官方微信(微信號:ikekenet)

    每天向大家推送短小精悍的英語學習資料.

    添加方式1.掃描上方可可官方微信二維碼。
    添加方式2.搜索微信號ikekenet添加即可。
    主站蜘蛛池模板: 出埃及记电影| 生死搏斗| 画江湖之不良人电影| 松果儿| 中国人数| 风云2演员表全部| 东方电视台节目表今日节目| 陈一龙是哪部电视剧| 金发女郎| 与心有关的成语| cctv6电影节目表| 山东卫视体育频道| 我姨| av电影网| 伊藤爱子| 电影《皮埃里诺》免费观看| 性文章| 郑中基的电影全部作品| 国庆十点钟 电影| 都市频道在线直播回放| 宣彤电影| 少年歌行第三季| 张国立主演电视剧全剧大全免费观看| 《爱你》演员表| 碳水是指哪些食物| 凯登克罗斯| 建设工程档案归档整理规范| 视频爱爱| 恰纳卡莱之战完整版在线观看| 因鬼六罪恶六芒星| 泰国av| 黑丝高跟在线| 彭丹丹最惊艳的电影| 东方卫视节目表| 美女污视频网站| 中转停留| 四年级上册语文书有鬼| 麻豆视频观看| 老外毛片| 命运的逆转| 你知道我在等你吗吉他谱|