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七年级生物下册4.4.3输送血液的泵—心脏情景导入素材（新版）新人教版.doc

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14.4.3 输送血液的泵心脏 情景导入首先让学生做个体验：用手放在胸前，感受哪个部位心跳最剧烈？并找同学上来演示给大家。引导学生总结出心脏的位置：一般来讲，在胸腔中部偏左下方，大小如本人的拳头大小。那么心脏是怎样博动的？心脏的结构和功能是怎样的？我们通过本节课来学习。展示学习目标，进入新知学习环节。1说出心脏的位置和形态。2描述心脏的结构和功能。3描述心脏的工作过程。

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