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Page 118.
第 118 頁。
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Read.
閱讀。
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The Human Body.
人體。
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Systems at Work.
工作中的系統
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The human body is amazing for many reasons.
人體之所以神奇，原因有很多。
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First of all, it is made up of many parts.
首先，它由許多部分組成。
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Each part is special and has an important job to do.
每個部分都很特別，都有重要的工作要做。
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Secondly, all of the parts work together in systems that do even bigger jobs.
其次，所有部件在系統中協同工作，完成更大的任務。
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In addition, all of those systems work together as one unit, so that you can live a happy and healthy life.
此外，所有這些系統作為一個整體協同工作，讓您過上快樂健康的生活。
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In ancient times, people used to think differently about the human body.
在古代，人們對人體有不同的看法。
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Today, we know that there are over ten major systems in the human body.
今天，我們知道人體有十多個主要系統。
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Let's look at how two of these systems work together for your good health.
讓我們來看看這兩個系統是如何共同為您的健康服務的。
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The Respiratory System.
呼吸系統
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This system first brings oxygen into your lungs.
該系統首先將氧氣帶入肺部。
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It takes carbon dioxide out of your lungs.
它能將二氧化碳排出肺部。
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The respiratory system has three major parts, the trachea, the lungs, and the diaphragm.
呼吸系統由氣管、肺和橫膈膜三大部分組成。
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The Circulatory System.
循環系統
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This system first carries blood containing oxygen and nutrients to all of the cells in your body.
該系統首先將含有氧氣和營養物質的血液輸送到體內所有細胞。
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It then removes carbon dioxide and other waste products from those cells.
然後，它將二氧化碳和其他廢物從這些細胞中排出。
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The circulatory system has four major parts, the heart, the arteries, the veins, and the capillaries.
循環系統由心臟、動脈、靜脈和毛細血管四大部分組成。
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Blood moves through these parts.
血液在這些部位流動。
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Two Systems Working Together as One.
兩個系統合二為一
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When you breathe in, your diaphragm first moves down so your lungs can get bigger.
吸氣時，橫膈膜首先向下運動，這樣肺就能變大。
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As a result, air flows into your nose or mouth through your trachea and into your lungs.
是以，空氣會通過氣管流入鼻腔或口腔，然後進入肺部。
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This air has oxygen in it, which your body needs to live.
空氣中含有人體所需的氧氣。
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Next, this oxygen goes into the blood of the capillaries inside your lungs.
接著，這些氧氣會進入肺部毛細血管的血液中。
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The capillaries carry this oxygen-rich blood to the pulmonary veins.
毛細血管將富含氧氣的血液輸送到肺靜脈。
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These veins then take this blood to the left side of your heart.
然後，這些靜脈會將血液輸送到心臟左側。
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Next, your heart pumps this blood into thick tubes called arteries.
然後，心臟將這些血液泵入稱為動脈的粗管。
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The arteries then carry this blood to all of the cells in your body.
然後，動脈將這些血液輸送到體內的所有細胞。
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The cells use the oxygen in this blood to keep your body healthy.
細胞利用血液中的氧氣保持身體健康。
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While your cells use the oxygen, they also create carbon dioxide after they use the oxygen.
細胞在使用氧氣的同時，也會產生二氧化碳。
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Your body doesn't need carbon dioxide, so the blood in your veins carries the carbon dioxide back to the right side of your heart.
您的身體不需要二氧化碳，是以靜脈中的血液會將二氧化碳帶回心臟右側。
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The heart then pumps this blood into your lungs.
然後，心臟將這些血液泵入肺部。
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After this happens, the carbon dioxide in this blood goes back into the air in your lungs.
之後，血液中的二氧化碳會回到肺部的空氣中。
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Finally, your diaphragm moves up and squeezes your lungs, and the air in your lungs goes out of your nose or mouth.
最後，橫膈膜上移並擠壓肺部，肺部的空氣從鼻子或嘴裡排出。
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These two systems work well together.
這兩個系統配合得很好。
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They bring oxygen-rich blood to every part of your It is easy to see why the human body is called the most amazing machine in the world.
它們將富含氧氣的血液輸送到身體的每一個部位。 不難看出，為什麼人體被稱為世界上最神奇的機器。
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You breathe about 20,000 times every day.
你每天要呼吸約 20,000 次。
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Check your lung power. 1.
檢查你的肺活量1.
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Get a package of large balloons.
買一包大氣球。
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Make sure they are all the same size.
確保它們的大小相同。
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Give one to each friend. 2.
給每個朋友一份。2.
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Tell everyone to blow once into their balloons, filling them as much as possible.
告訴大家向氣球吹一次氣，儘量吹滿。
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Then, measure the balloons.
然後，測量氣球。
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Whose is the biggest?
誰的最大？
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Put your two fists together.
把你的兩個拳頭握在一起。
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This is about the size of your heart.
這和你的心臟差不多大。
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Check your heartbeat. 1.
檢查心跳1.
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Place two fingers on your wrist below your thumb.
將兩根手指放在拇指下方的手腕上。
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Can you feel blood moving through the artery?
您能感覺到血液在動脈中流動嗎？
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This is your pulse, which you can count to measure your heartbeat. 2.
這是您的脈搏，您可以通過數脈搏來測量心跳。2.
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Count the number of beats you feel in one minute.
數一數您在一分鐘內感受到的心跳次數。
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Compare your heartbeat with your friend's.
將您的心跳與您朋友的心跳進行比較。
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Thank you for watching.
感謝您的收看。
