江西省万载县高中生物第1章人体的内环境与稳态1.1细胞生活的环境3(练习课)教案新人教版必修3.doc

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1 -1.1 细胞生活的环境 3(练习课)教学目标 复习巩固所学知识,培养学生运用知识的能力重点 查缺补漏,培养学生运用知识的能力难点 查缺补漏,培养学生运用知识的能力教学过程 时间 设计意图 个人备课一、 知识点总结1 体内细胞生活在细胞外液中2.细胞外液的成分3.细胞外液的理化性质4.组织水肿及其产生原因5.等渗溶液、低渗溶液、高渗溶液6.内环境是细胞与外界环境进行物质交换的媒介7. 细胞与外界环境进行物质交换过程穿模层数分析二、习题讲解世纪金榜课时作业本“课时作业一”三、习题巩固【典例】(2016安阳高二检测)对人体内环境理化特性及调节途径叙述正确的是( )A.血浆中血浆蛋白的含量越多,血浆渗透压越低B.人体细胞外液中维持渗透压的阳离子主要是 K+C.血浆中含乳酸过多时,会与 、 反应D.毛细血管破裂,会引起血浆渗透压降低【解题探究】(1)血浆蛋白含量与血浆渗透压的关系:血浆蛋白含量_,血浆渗透压越高,反之亦然。(2)血浆 pH 的维持:内环境中含有_等缓冲物质。【解析】选 C。【互动探究】3402总结知识点,加深对本课的理解讲解练习,培养学生运用知识的能力通过练习巩固,进一步加深对本课的掌握3HCO24P- 2 -(1)A 项中,只有血浆蛋白能维持血浆渗透压吗?为什么?(2)D 项中毛细血管壁通透性增加是否会出现组织水肿?并解释其原因。教学反思

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