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But what we have is, the heart pumps de-oxygenated blood from the right ventricle.
那么我们看到，心脏把缺氧血从右心室排出
You're saying, hey, why is it the right ventricle?
大家可能要问，为什么是从右心室出来呢？
That looks like the left side of the drawing,
这不是在图的左边吗？
but it's this dude's right-hand side, right?
但是，对于图中的人来说，这却是他的右边
This is this guy's right hand.
这边是这个人的右手边
And this is this dude's left hand.
这是左手边
He's looking at us, right?
因为跟我们是面对面的，所以方向刚好相反
We don't care about our right or left.
要考虑的不是我们的左右手边
We care about this guy's right and left.
而是要以这个人的左右为准
And he's looking at us.
因为是面对面
He's got some eyeballs and he's looking at us.
这里是他的眼睛，我们是面对面的
So this is his right ventricle.
这是右心室
Actually, let me just start off with the whole cycle.
我们来看一下整个循环
So we have de-oxygenated blood coming from the rest of the body,right?
缺氧血从身体各处运送而来
This is de-oxygenated blood coming from the rest of the body right here
这是从身体各处运送而来缺氧血
This is actually the name for this big pipe. It's called the inferior vena cava--inferior because it's coming up below.
这条大血管的名字是下腔静脉，之所以叫下腔静脉，是因为它是在下部
Actually, you have blood coming up from the arms and the head up here.
血液从胳膊，头部等各处而来
They're both meeting right here, in the right atrium.
来到右心房
Let me label that.
我标一下
I'm going to do a big diagram of the heart in a second. So it's the right atrium.
等会我们要单独看一下心脏的图示，这里是右心房
And why are they de-oxygenated?
为什么说这里是缺氧血呢？
Because this is blood returning from our legs if we're running, or returning from our brain,
因为这可能是从腿部回来的血，或者说从头部回来的血
which needed- that had to use respiration--
这些经过呼吸作用
or maybe we're working out and it's returning from our biceps, but it's de-oxygenated blood.
比方说我们在健身，腿部或者二头肌产生一定的消耗，这里是缺氧血
It shows up right here in the right atrium.
汇入右心房
It's on our left, but this guy's right-hand side.
这是我们的左手边，但对这个人来说是右手边
From the right atrium, it gets pumped into the right ventricle.
血液从右心房压入右心室
It actually passively flows into the right ventricle.
血液其实是被动流入心室的
The ventricles do all the pumping, then the ventricle contracts and pumps this blood right here
至于心脏对血液的排挤输送，都在心室中完成，心室收缩，把血液挤压出去
and you don't see it, but it's going behind this part right here.
大家可能看不到，这部分在后边
It goes from here through this pipe.
从这条血管出去
So you don't see it.
大家可能看不到
I'm going to do a detailed diagram in a second-- into the pulmonary artery.
我马上画一个更详细的表格，流入肺动脉
We're going away from the heart.
血液远离心脏
This was a vein, right?
这是一条静脉
This is a vein going to the heart.
这里是流向心脏的
This is a vein, inferior vena cava vein.
这是下腔静脉
This is superior vena cava.
这是上腔静脉
These are veins. They're de-oxygenated.
这些都是静脉，运送缺氧血
Then I'm pumping this de-oxygenated blood away from the heart to the lungs.
然后在心室把血液挤压入肺部
Now this de-oxygenated blood, this is in an artery, right?
现在缺氧血是在动脉中
This is an pulmonary artery.
这里是肺动脉
Then it gets oxygenated and now it's a pulmonary vein.
然后氧气得到补充，进入肺静脉
And once it's oxygenated, it shows up here in the left-- let me do a better color than that--
血液变成含氧血之后，我画的清楚一些
it shows up right here in the left atrium.
血液流入左心房
Atrium, you can imagine-- it's kind of a room with a skylight
大家可以把左心房看成是
or that's open to the outside and in both of these cases, things are entering from above--
上方开口的一个房间，两个心房都是从上方流入血液
not sunlight, but blood is entering from above.
说是像阳光一样倾泻可能不太恰当
On the right atrium, the blood is entering from above.
在右心房，血液从上方流入
And in the left atrium, the blood is entering-- and remember,
左心房里，注意
the left atrium is on the right-hand side from our point of view--
在我们看来，左心房是在右边
on the left atrium, the blood is entering from above from the lungs, from the pulmonary veins.
左心房中，血液是从上方的肺部通过肺静脉流入
Veins go to the heart.
静脉血流向心脏
