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原始文本 - 英语 - how the heart works

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本文可用以下语言: 英语西班牙语

讨论区 科学

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how the heart works
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提交 ana maria rios pabon
源语言: 英语

How the heart works

Today, we talk about the object of his work. The heart is a complex organ that starts beating a few weeks after conception. At this point the heart is a tube. In the coming days, it grows and bends into the shape or the heart.

Later, it divides into four parts. As the heart beats, it pumps blood through these chambers and the blood vessels in the body. The body is estimated to have at least ninety six thousand kilometers of bloods vessels.
给这篇翻译加备注
necesito una traduccion exacta.
aqui no esta el texto completo pero si me pueden ayudar con esto gracias
上一个编辑者是 lilian canale - 2010年 十二月 29日 16:11





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2010年 十二月 29日 16:03

gamine
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CC: lilian canale