七年级生物下册4.5人体内废物的排出重难点点拨素材(新版)新人教版.doc

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14.5人体内废物的排出 重难点点拨1、重点:肾脏的结构 ,尿的形成过程。2、难点:学生对肾小球的过滤作用和肾小管的重吸收作用的理解。3、重、难点突破:(1)利用多媒体给学生充分空间去思维、去想象, 自主直观地学习,然后让学生观察肾脏的宏观结构和肾脏纵切的内部结构,引出肾脏的微观结构肾单位。(2)利用挂图和不同颜色的磁铁让学生亲自动手来体验肾小球的过滤作用和肾小管的重吸收作用。(2)展示尿的形成过程的多媒体动画,进一步让学生形成整体的认识。(3)用真实病例来总结,让学生自我探究,构建知识。

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