七年级生物下册4.5《人体内废物的排出》教案1(新版)新人教版.doc

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1、1第五章人体内废物的排出教材分析:通过创设情景,组织学生看图,让学生描述人体泌尿系统的组成,知道肾脏是形成尿液的主要器官。通过图表分析,利用插图概述尿液的形成和排出过程。学情分析:学生对尿的形成和排出这一生理现象虽熟悉,但尿是怎样在肾脏中形成还不清楚。尤其肾脏的结构和功能,学生不易理解。所以教师要注意多从生活实际出发,通过图片分析和 CAI 展示,帮助学生加深理解和认识。教学目标:1、 描述人体泌尿系统的组成2、 概述尿液的形成和排出过程教学策略:创设情景-看图自学-分析讨论-教师点拨-相互交流-得出结论教学过程:教学内容 学生活动 教师活动1、 泌尿系统的组成肾脏:形成尿液输尿管:输送尿液膀

2、胱:暂存尿液尿道:排出尿液2、 尿的形成肾脏:100 万个肾单位组成肾单位:肾小球肾小囊肾小管肾小球是个血管球肾小球和肾小囊外面缠绕大量的毛细血管肾小球的过滤:形成原尿激情、质疑看书、归纳相互交流看图、交流归纳、总结认识肾脏的结构认同结构和功能相统一创设情景:结合学生生活实际,区分排泄和排遗,导入新课。指导学生看书、自学,了解泌尿系统的组成引导学生看图,质疑,进入下一步探究点拨、鼓励质疑:人每天形成原尿 1502肾小管重吸收:形成尿液3、 尿的排出意义:排出废物;调节体内水和无机盐的平衡;维持组织细胞正常的生理功能。知道排尿的意义进一步巩固解答升,而排出的尿液却只有1.5 升,这是为什么?组织学生进一步探究知识回顾感悟与收获达标检测:瞭望角布置作业

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