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So just like before,
好，就像剛講解的
where it went from the right atrium to the right ventricle,
血液從右心房到右心室
now we're going from the left atrium to the left ventricle.
這里血液從左心房到左心室
And it passes through a valve here.
中間還是穿過一個瓣膜
So this valve is called the mitral valve.
這個瓣膜是二尖瓣
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.
還是確保血液不會從左心室逆流回左心房
It wants to make sure that there's forward flow.
確保血液必須是向前流動的
And then the final valve-- I have to find a nice spot to write it, maybe right here.
最后，我找個地方寫清楚一點，寫在這里
This final valve that it passes through is called the aortic valve.
最后這個瓣膜，叫做主動脈瓣
And the aortic valve is going to be
主動脈瓣
what divides the left ventricle from this giant vessel that we talked about earlier.
是把左心室和這條血管分開，血管我們剛介紹了
And this is, of course, the aorta.
這是主動脈
This is my aorta.
這是主動脈
So now blood is going to go through the aorta to the rest of the body.
血液通過主動脈，輸送到身體各處
So you can see how blood now flows from the body into the four chambers.
大家現在知道血液如何從身體各處流回心臟
First into the right atrium-- this is chamber number one.
首先進入右心房，這是第一站
And then it goes into the right ventricle.
然后進入右心室
This is chamber number two.
這是心臟中的第二站
It goes to the lungs and then back out to the left atrium.
然后進入肺，從肺進入左心房
So this is chamber number three.
這是心臟中的第三站
And then the left ventricle.
最后是左心室
And this happens every moment of every day.
這個過程在我們身體中每時每刻都在進行
Every time you hear your heart beating, this process is going on.
大家的每次心跳，都在進行這樣的過程
