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A
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我们知道，人体内物质的运输主要是由血液来完成的。那么，血液在人体哪些部位流动？
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wǒmen zhīdào, réntǐ nèi wùzhì de yùnshū zhǔyào shì yóu xuèyè lái wánchéng de. nàme, xuèyè zài réntǐ nǎxiē bùwèi liúdòng?
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We know that the movement of the most vital internal components in the body is done by the blood. Now, how does the blood flow through the body then?
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B
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血液当然是在血管中流动啦！血管就像上海的道路一样，很复杂！一个人的全部血管连接起来有10万公里长！
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xuèyè dāngrán shì zài xuèguǎn zhōng liúdòng la! xuèguǎn jiù xiàng Shànghǎi de dàolù yīyàng, hěn fù zá ! yī ge rén de quánbù xuèguǎn liánjiē qǐlai yǒu shí wàn gōnglǐ cháng!
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Of course it flows through the blood vessels. Blood vessels are very complex--just like the roads of Shanghai. All the blood vessels in the human body if combined together come to 100,000 kilometers in length!
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C
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血液是在心脏和血管构成的管道中流动的。
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xuèyè shì zài xīnzàng hé xuèguǎn gòuchéng de guǎndào zhōng liúdòng de.
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The heart and the blood vessels are the pipes that the blood flows through.
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A
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很好。下面请同学们摸一摸自己的手腕，有什么在跳动吗？
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hěn hǎo. xiàmian qǐng tóngxué men mō yi mō zìjǐ de shǒuwàn, yǒu shénme zài tiàodòng ma?
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Very good. Next, students, please feel your own wrist for a moment. Can you feel anything beating?
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B
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老师，是脉搏在跳动！
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lǎoshī, shì màibó zài tiàodòng!
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Teacher, it's our pulse that's beating.
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A
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再看手背上的“青筋”，它是什么？
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zài kàn shǒubèi shang de" qīngjīn" , tā shì shénme?
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Now look at the blue veins on the back of your hand. What are these?
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C
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可以摸到的跳动的部位是动脉，手背上的“青筋”是静脉。人体内还有很多毛细血管。
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kěyǐ mōdào de tiàodòng de bùwèi shì dòngmài, shǒubèi shang de" qīngjīn" shì jìngmài. réntǐ nèi hái yǒu hěn duō máoxìxuèguǎn.
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Those that you can feel your pulse on are arteries. The blue veins on the back of your hand are veins. The human body also has a lot of capillaries.
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A
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很好。血管分动脉、静脉和毛细血管三种。
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hěn hǎo. xuèguǎn fēn dòngmài, jìngmài hé máoxìxuèguǎn sān zhǒng.
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Very good. There are three different types of blood vessels: arteries, veins and capillaries.
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B
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老师老师，为什么血是红色的？是不是因为血里有铁？
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lǎoshī lǎoshī, wèishénme xiě shì hóngsè de? shì bu shì yīnwèi xiě li yǒu tiě?
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Teacher, teacher, why is blood red? Is it because blood has iron in it?
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C
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林峰就会捣乱！人的血本来就是红的。
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Lín Fēng jiù huì dǎoluàn! rén de xiě běnlái jiùshì hóng de.
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Lin Feng always causes trouble. People's blood is red because it's red.
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B
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那广告上怎么说补铁可以补血？
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nà guǎnggào shang zěnme shuō bǔ tiě kěyǐ bǔ xiě?
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Doesn't that advertisement say if you take iron supplements it will benefit your blood?
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A
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林峰的问题很好。血色素里面有铁，所以是红颜色。另外血液里大量的红细胞也是红色的。
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Lín Fēng de wèntí hěn hǎo. xuèsèsù lǐmiàn yǒu tiě, suǒyǐ shì hóng yánsè. lìngwài xuèyè lǐ dàliàng de hóngxìbāo yě shì hóngsè de.
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Lin Feng's is a good question. There is iron in hemoglobin, so it is red. Furthermore, blood contains a large quantity of red blood cells, which are also red in color.
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B
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哦，我明白啦！可是静脉怎么看起来是蓝色的？
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ō, wǒ míngbai la! kěshì jìngmài zěnme kàn qǐlai shì lánsè de?
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Oh, I get it! But how come veins look blue?
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A
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好，我们先看一段录像，看看血液是怎么循环的，再来说静脉为什么看起来是蓝色的。
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hǎo, wǒmen xiān kàn yī duàn lùxiàng, kàn kan xuèyè shì zěnme xúnhuán de, zài lái shuō jìngmài wèishénme kàn qǐlai shì lánsè de.
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OK, let's first watch a video and see how blood circulates. Then we will talk about why veins look blue.
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B
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老师，血液循环还要经过肺啊！
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lǎoshī, xuèyè xúnhuán hái yào jīngguò fèi a!
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Teacher, the blood also circulates through the lungs?
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A
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对。血液循环包括肺循环和体循环。今天天气比较热，某些同学想睡觉了啊。下面，我叫谁，谁起来回答。
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duì. xuèyè xúnhuán bāokuò fèi xúnhuán hé tǐ xúnhuán. jīntiān tiānqì bǐjiào rè, mǒuxiē tóngxué xiǎng shuìjiào le a. xiàmian, wǒ jiào shéi, shéi qǐlai huídá.
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Yes. The blood circulates through both the lungs and the circulatory system. Today the weather is quite hot, some students are wanting to sleep. Now, whoever I call on has to stand up and answer.
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B
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陈磊陈磊！老师问你什么是肺？
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Chén Lěi Chén Lěi! lǎoshī wèn nǐ shénme shì fèi?
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Chen Lei, Chen Lei! The teacher asked you what are lungs?
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D
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嗯......人有两个肺......
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ng4...... rén yǒu liǎng ge fèi......
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Um... people have two lungs...
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BC
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哈哈哈......
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hā hā hā......
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Hah-hah-hah...
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