As you can see, everything depends on the flow of blood to and from the heart. 如你所见，一切取决于进出心脏血液的流动
So how does the heart do this?First, the heart, which is a muscle, has 4 chambers. 那么心脏怎么工作的？首先，心脏是肌肉有4个腔体
From one chamber, blood is pumped to the lungs. 从一个腔，血液泵到肺
This is the blood that carries carbon dioxide. 这是携带二氧化碳的血液
When the oxygenated blood from the lungs comes back to the heart, it enters another chamber. 当含氧血从肺部返回到心脏，进入另一个腔
This chamber is called the left atrium. 这个腔被叫做左心房
选择：
In addition to a supply of air, the circulatory system...depends on the flow of blood to and from the heart.
填空：
When the oxygenated blood from the lungs comes back to the heart, it enters another chamber。
From the left atrium, the oxygenated blood is pumped into another chamber, the left ventricle. 从左心房含氧血液被泵到另一个腔，左心室
The left ventricle then pumps the blood into the aorta, which is the largest artery in the body. 左心室然后将血液泵进入主动脉，这是人体最大的动脉
From the aorta, the oxygenated blood passes through a network of smaller arteries throughout the entire body, including the brain. 从主动脉，含氧血通过小的动脉遍及整个身体，包括大脑
Blood returns to the heart through a system of veins and enters the upper right chamber, the right atrium. 血液返回到心脏 通过静脉系统进入右上方的腔，右心房
听音选择：
What is the largest artery in the body? -the aorta
填空：
From the left atrium, the oxygenated blood is pumped into another chamber, the left ventricle.The left ventricle then pumps the blood into the aorta,which is the largest artery in the body.From the aorta, the oxygenated blood passes through a network of smaller arteries throughout the entire body, including the brain.
Now that we understand a little about the circulatory system we can ask what it needs to operate. 现在我理解一点关于循环系统，我们可以问他需要什么来运转
Of course it can't operate without energy.当然没有能量它不能运转
This energy is supplied by another system, the digestive system, which gets energy from food.这个能量通过其它系统提供，消化系统，从食物中得到能量
And of course these systems need to be supported and controlled. 当然这些系统需要被支持和控制
Our skeletal system provides support, and our muscular system provides control and movement. 我们的骨骼系统提供支撑 而我们的肌肉系统提供控制和活动
Without support and movement, we couldn't get the food that we need for energy. 没有支撑和活动我们不能得到提供能量的食物
Only plants can do this because they have a completely different system, which gets energy directly from the sun. 只有植物能做到，因为他们有一个完整的不同系统 ，直接从太阳得到能量
听音选择：
What supplys energy to the circulatory system? - the digestive system
填空：
Without support and movement, we couldn't get the food that we need for energy. Only plants can do this because they have a completely different system, which gets energy directly from the sun.
To summarize, the human body is like a huge, complex factory. 总结一下，人类身体就像一个巨大的复杂的工厂
The language we use to describe how it functions is the same language we use to describe almost any industrial process. 我们使用描述它怎样运转的语言与我们使用描述几乎任何工业过程的语言一样
The vocabulary is different, but the processes, flows and logical relationships are almost identical. 词汇是不同的，但是流程和逻辑关系几乎是相同的
Think of some familiar process in your life or job and see if you can describe and explain it in English. 想想在你生活或工作中熟悉的过程看看是否能用英语描述和解释它
填空：
The human body is like a huge, complex factory. The language we use to describe how it functions is the same language we use to describe almost any industrial process. The vocabulary is different, but the processes, flows and logical relationships are almost identical.
听说：
The digestive system supplies energy to the circulatory system.
Plants get energy directly from the sun by using photosynthesis.
This is the blood that carries carbon dioxide.
阅读：
The heart uses a network of arteries and veins to circulate blood throughout the body.
Blood returns to the heart through a system of veins and enters the upper right chamber, the right atrium.
The digestive system supplies energy to the circulatory system.
Plants get energy directly from the sun by using photosynthesis.）
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