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七年级生物下册4.4.1流动的组织—血液情景导入素材（新版）新人教版.doc

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1流动的组织血液 情景导入我们都知道，长江、黄河养育了亿万中华儿女，同样，在我们体内也有一条生命之河，那就是血液，它像课件上的小河一样不停流动。它能及时将养料运输给细胞，又能及时运走体内的废物，这条运输线就是遍布全身各处的血管。血管里流动着血液。那么，血液有哪些成分组成？各成分又有何功能呢？这就是我们本节课要学的内容，流动的组织血液。

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