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本集视频介绍了心脏中血液流动的顺序，即由右心房开始，中间进入肺，最后由左心室流出的过程，帮助观者熟悉心脏工作时的血液流动情况。
n. 瓣膜，阀门，电子管，真空管
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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
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