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So going to our big diagram now.
好，我们来看大图
We can see that blood coming in this way
大家可以看到，
and blood coming in this way is ending up at the same spot.
不同方向的血液都汇聚到这里来
It's going to end up at the--
都在这里
actually, maybe I'll draw it here-- is ending up at the right atrium.
我写一下，这是右心房
That's just the name of the chamber that the blood ends up in.
这是心脏中四个房室之一
And it came into the right atrium from a giant vessel up top called the superior vena cava.
血液从大静脉进入右心房，上边的大静脉叫上腔静脉
And this is a vein, of course,
很明显，这是静脉
because it's bringing blood towards the heart.
这是输送进入心脏血液的
And down here, the inferior vena cava.
下方的静脉是下腔静脉
So these are the two directions that blood is going to be flowing.
这是血液流动的两个方向
And once blood is in the right atrium,
一旦血液进入右心房
it's going to head down into the right ventricle.
就会接着流入右心室
So this is the right ventricle, down here.
下边这里就是右心室
This is the second chamber of the heart.
这是心脏的第二个房室
And it gets there by passing through a valve.
右心室和右心房之间，有一个瓣膜
And this valve, and all valves in the heart,
心脏中所有的瓣膜
are basically there to keep blood moving in the right direction.
都是为保证血液能流向正确的方向
So it doesn't go in the backwards direction.
使得血液不至于逆流
So this valve is called the tricuspid valve.
这个瓣膜叫三尖瓣
And it's called that because it's basically got three little flaps.
之所以叫三尖瓣，是因为它由三个瓣膜构成
That's why they call it tri.
才有词首tri-（意思是三）
And I know you can only see two in my drawing,
大家可能只能看到两个瓣膜
and that's just because my drawing is not perfect.
这是手画的缺点
And it's hard to show a flap coming out at you,
很难画一个正对你们的瓣膜
but you can imagine it.
大家可以自己想象一下
So blood goes into the right ventricle. And where does it go next?
好，血液进入右心室以后又会怎样呢？
Well after that, it's going to go this way.
在这之后，血液来到这里
It's going to go into this vessel, and it's going to split.
通过这条血管，血液兵分两路
But before it goes there, it has to pass through another valve.
不过中间还要通过一个瓣膜
So this is a valve, right here, called the pulmonary valve.
叫做肺动脉瓣
And it gives you a clue as to where things are going to go next.
听到这个名字，大家可能知道血液的下一个目的地在哪里了
Right? Because the word pulmonary means lungs.
肺动脉瓣，很明显跟肺有关
