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So what you're looking at is basically kind of a mechanistic way of thinking about the heart.
大家现在看到的是心脏的图示
Almost it's a couple of pumps with pipes attached to the pumps.
虽然看起来就是泵和一些路线的集合
And in the way, that's not a bad way to think about the heart.
不过这样看，心脏工作更好理解
In fact we're going to kind of move through this diagram.
我们可以跟随血液流动，来看这个图
I realize that it looks little bit scary.
可能看起来很抽象
But, once I start labeling these stuff you'll start to see that it is actually not as bad as it seems.
不过我们标记一下各部分之后，应该会更好理解一点
So let's get started in the upper part of the heart.
好，我们看心脏上部
The right atrium, It's right there.
这是右心房
And the blood goes down into the right ventricle.
然后血液流入右心室
And then, on the other side I'm going to label the last two chambers.
这边是另外两个房室
The left atrium and the left ventricle.
左心房和左心室
We're going to actually follow the path of blood after it leaves the right ventricle.
我们顺着血液离开右心室后流动的路线来看
We're going to start our journey here at the right ventricle.
从右心室开始
So what's the first thing that kind of comes across?
首先会遇到什么呢？
Well, blood leaves the right ventricle, goes through a valve and after,
血液离开右心室之后，经过瓣膜
on the other side you've got, this area right here.
就来到这里
And I've drawn it as one tube with no split and this is the pulmonary trunk. Pulmonary trunk.
我只画一条路线，没有分支，这是肺动脉干
So blood is headed towards the lungs, going first through the trunk,
血液流向肺部，穿过动脉干
and of course after the trunk, there is left and right --
当然，有左肺和右肺
I write that up here-- pulmonary arteries are next.
我写在这里，然后是肺动脉
And remember I call them arteries, because they're going away from the heart.
动脉的意思就是输送离开心脏的血液的血管
And there are two arteries, so pulmonary arteries left and right pulmonary arteries.
这是两条动脉，这是左肺动脉和右肺动脉
And that's why you see two things here, one here and you see one here and those are basically tubes.
这是这两条血管，一边一条，这就是两条血管
So it's going from the pulmonary trunk,
从肺动脉干流出来
it's splitting into one of the two tubes and I'm drawing the left and right lung up top.
分成这两条动脉，把左肺和右肺画上
Of course you know that the lungs are actually not going to look this way
当然，肺实际上不是这样的
so this is not anatomically correct.
并不是严格按照解剖学画的
But this is not --as I said in the beginning-- bad way of thinking about it.
我之前介绍了，这样看比较方便一些
So blood goes through the lungs and then comes out on the other side and there,
血液流过肺部，来到这里
we're going to talk about the left and right pulmonary veins.
这是左肺静脉和右肺静脉
And actually here I'm going to make the point that
这里我们要明确一点
there aren't just two pulmonary veins, one for each lung.
并不是只有两条肺静脉，一边一条
Actually they're usually more than that.
实际上，静脉有很多
And so when I draw these two,
我画的这两条
I really want you to just think of the two sides, veins coming from both sides.
大家可以想成是代表两边的静脉，这代表两边的静脉
But the actual number could be a few pulmonary veins in total.
但实际上静脉数量可能很多
The pulmonary veins drain blood and into the left atrium, right.
通过肺静脉，血液进入左心房
So now we are on the other side of the heart.
现在来到心脏的另一边
And for the moment I'm going to kind of pause the journey here.
这时我们要暂停一下
So we've gone from the right ventricle around to the lungs, back again into the left atrium.
我们从右心室来到了肺部，然后回到左心房
And this is kind of the first part of our journey.
这是我们研究的第一个过程
And this part of the journey is called the pulmonary circulation.
这个过程叫做肺循环
I'm actually just going to write that here - Pulmonary circulation.
我写在这，这就是肺循环
So the fact that this part starting from the heart and going back to the heart is one circuit.
从心脏流出又回到心脏，这是一个循环
And our heart actually has two circuits.
不过心脏中存在两种循环
But I want to point out these circuits one at a time.
我们一一介绍
We've already kind of completed one circuit.
现在介绍了肺循环
