chamber
英 /ˈtʃeɪmbə(r) 美 /[ˈtʃeɪmbər]
n.室;会议厅;(议会的)议院;(作特定用途的)房间;腔，室;洞穴;卧室
adj.秘密的;在小厅内表演的
v.装(子弹)；把…关在室内；使有房间
atrium
英 /ˈeɪtriəm 美 /[ˈeɪtriəm]
n.(现代建筑物中央通常带有玻璃屋顶的)中庭，中厅;(古罗马大宅的)天井;心房
ventricle
英 /ˈventrɪkl 美 /[ˈventrɪkl]
n.心室;(体内的)室，腔;(尤指)脑室
aorta
英 /eɪˈɔːtə 美 /[eɪˈɔːrtə]
n.主动脉
artery
英 /ˈɑːtəri 美 /[ˈɑːrtəri]
n.动脉;干线(指主要公路、河流、铁路线等)
entire
英 /ɪnˈtaɪə(r) 美 /[ɪnˈtaɪər]
adj.全部的;整个的;完全的
n.全部;整体;一种黑啤酒;种马
vein
英 /veɪn 美 /[veɪn]
n.静脉;叶脉;翅脉;纹理;纹路;条纹;矿脉;量;风格
v.使有筋脉[纹理]
digestive
英 /daɪˈdʒestɪv 美 /[daɪˈdʒestɪv]
adj.消化的;和消化有关的
n.消化剂;(全麦)消化饼干
skeletal
英 /ˈskelətl 美 /[ˈskelətl]
adj.骨骼的;骨瘦如柴的;梗概的;提纲性的;提要性的;轮廓的
muscular
英 /ˈmʌskjələ(r) 美 /[ˈmʌskjələr]
adj.肌肉的;肌肉发达的;强壮的
vocabulary
英 /vəˈkæbjələri 美 /[vəˈkæbjəleri]
n.(某学科中所使用的或某一语言的)词汇;(某人掌握或使用的)词汇量;词汇表
identical
英 /aɪˈdentɪkl 美 /[aɪˈdentɪkl]
adj.完全相同的;相同的;完全同样的;同一的
As you can see, everything depends on the flow of blood to and from the heart.
So how does the heart do this?
First, the heart, which is a muscle, has 4 chambers.
From one chamber, blood is pumped to the lungs.
This is the blood that carries carbon dioxide.
When the oxygenated blood from the lungs comes back to the heart, it enters another chamber.
This chamber is called the left atrium.
Q:What does the blood pump to the lungs carry?
A:It carries CO2.
In addition to a supply of air,the circulatory system depends on the flow of blood to and from the heart.
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.
Blood returns to the heart through a system of veins and enters the upper right chamber, the right atrium.
Now that we understand a little about the circulatory system we can ask what it needs to operate.
Of course it can't operate without energy.
This energy is supplied by another system, the digestive system, which gets energy from food.
And of course these systems need to be supported and controlled.
Our skeletal system provides support, and our muscular system provides control and movement.
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.
Q:What life forms get energy directly from the sun?
A:Plants.
To summarize, 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.
Think of some familiar process in your life or job and see if you can describe and explain it in English.
Our bodies function very much like a huge,complex factory.
Our skeletal system provides physical support for our bodies.
Plants get energy directly from the sun by using photosynthesis.
The heart uses a network of arteries and veins to circulate blood throughout the body.
The digestive system supplies energy to the circulatory system.
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