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But you also know that if that's what's making noise,
那么大家可能要想，如果這時(shí)三尖瓣和二尖瓣關(guān)閉
you can kind of guess-- and it's a very smart guess--that
你可能想到，也很容易想到
at the same time, the pulmonic valve and the aortic valve just opened.
肺動(dòng)脈瓣和主動(dòng)脈瓣會(huì)打開(kāi)
So if the other valves snap shut, these just opened. Right?
如果這兩個(gè)瓣膜關(guān)閉，剩下兩個(gè)就會(huì)打開(kāi)
You can kind of assume that, although the noise you're hearing is actually from here.
大家可以想一下，大家聽(tīng)到的心跳聲是瓣膜關(guān)閉的聲音
So what's happening with dub? Well, the opposite.
這個(gè)“噠”的情況就跟第一聲相反
And what I mean by that is--let me now show you what happens a moment later.
相反的意思就是，我馬上給大家介紹
Well, after the ventricles are done squeezing,
心室把血液壓入血管之后
then we get to a point where you might have a little bit of flow that way and that way, just as I drew before.
這時(shí)血液可能會(huì)有這樣的流動(dòng)，跟之前畫(huà)的一樣的
And these valves snap shut as well. So now these snap shut.
這時(shí)瓣膜還是要關(guān)閉
And as these snap shut-- because they don't want to allow backflow, right?
這兩個(gè)瓣膜關(guān)閉是為了防止血液回流
They're going to snap shut like that. They make noise.
瓣膜關(guān)閉，就有了聲音
And so when you have dub,
所以大家說(shuō)的第二個(gè)心音
you actually have noise coming from the pulmonic and aortic valve snapping shut.
實(shí)際上是來(lái)自肺動(dòng)脈瓣和主動(dòng)脈瓣關(guān)閉的聲音
And that must mean that then the other two valves just opened up
這就意味著另外兩個(gè)瓣膜是打開(kāi)的
the tricuspid and mitral just opened.
三尖瓣和二尖瓣是打開(kāi)的狀態(tài)
You can assume that, right?
大家能理解吧？
And I didn't draw that in the picture.
圖里還沒(méi)有修改
Let me update my picture now to show that.
我來(lái)改一下
So now these two have opened up, and blood is coming into the ventricles again.
現(xiàn)在三尖瓣和二尖瓣是打開(kāi)的，血液又進(jìn)入心室
So it's actually a nice little rhythm that you get going.
大家看到，心音是很有規(guī)律的
And every time these valves go open and shut, you hear noise.
每次瓣膜關(guān)閉，都會(huì)有聲音
So you can kind of figure out what's happening based on-- and these actually-- let me erase that.
大家可以想象一下，我把這些擦掉
