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So just like before,
好，就像刚讲解的
where it went from the right atrium to the right ventricle,
血液从右心房到右心室
now we're going from the left atrium to the left ventricle.
这里血液从左心房到左心室
And it passes through a valve here.
中间还是穿过一个瓣膜
So this valve is called the mitral valve.
这个瓣膜是二尖瓣
And its job is, of course,
它的作用
to make sure that blood does not go from the left ventricle back to the left atrium by accident.
还是确保血液不会从左心室逆流回左心房
It wants to make sure that there's forward flow.
确保血液必须是向前流动的
And then the final valve-- I have to find a nice spot to write it, maybe right here.
最后，我找个地方写清楚一点，写在这里
This final valve that it passes through is called the aortic valve.
最后这个瓣膜，叫做主动脉瓣
And the aortic valve is going to be
主动脉瓣
what divides the left ventricle from this giant vessel that we talked about earlier.
是把左心室和这条血管分开，血管我们刚介绍了
And this is, of course, the aorta.
这是主动脉
This is my aorta.
这是主动脉
So now blood is going to go through the aorta to the rest of the body.
血液通过主动脉，输送到身体各处
So you can see how blood now flows from the body into the four chambers.
大家现在知道血液如何从身体各处流回心脏
First into the right atrium-- this is chamber number one.
首先进入右心房，这是第一站
And then it goes into the right ventricle.
然后进入右心室
This is chamber number two.
这是心脏中的第二站
It goes to the lungs and then back out to the left atrium.
然后进入肺，从肺进入左心房
So this is chamber number three.
这是心脏中的第三站
And then the left ventricle.
最后是左心室
And this happens every moment of every day.
这个过程在我们身体中每时每刻都在进行
Every time you hear your heart beating, this process is going on.
大家的每次心跳，都在进行这样的过程
