【新教材核心素养】苏教版生物八年级上册5.12.2《消化和吸收》第2课时(教学设计)

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名称 【新教材核心素养】苏教版生物八年级上册5.12.2《消化和吸收》第2课时(教学设计)
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科目 生物学
更新时间 2025-08-08 19:16:03

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/ 让教学更有效 高效备课 | 生物学科
第12章 消化系统
第2节 消化和吸收(第2课时)
年级 八年级 课时安排 2课时
课题 第2节 消化和吸收(第2课时)
教材分析 本节课是苏教版初中生物八年级《消化和吸收》的第一节内容,是进入人体生理与健康学习的第二节部分内容。教材呈现了消化系统由消化道和消化腺组成,介绍消化的含义,引入酶的概念,结合实验探究食物在口腔中的化学性消化,分析淀粉、蛋白质和脂肪的消化过程,并通过吸收将营养物质转运到血液中,深入分析小肠作为吸收主要场所的结构特点,形成生物学的结构与功能观。
教学目标 (
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)2.消化系统能够将食物消化,并通过吸收将营养物质转运到血液中。 教学难点: 1.通过实验探究,食物在口腔中的化学性消化。 2.分析小肠结构与吸收功能相适应的特点。
教学过程
教学内容 教师活动 (
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)阅读课本P15~P16,思考: (
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)1.什么是消化? 2.消化可以分为哪些类型? 3.哪些物质需要消化才能被吸收呢? 4.淀粉、蛋白质和脂肪的消化过程是如何的? 5.食物在口腔中是如何消化的呢? (
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)教师引导总结:酶的作用方式是多样的,不能一概而沦为“剪刀”式的分解,还有其他功能。1.酶的分解功能,有些酶像“剪刀”一样,将大分子分解为小分子。如唾液淀粉酶。2.酶的合成功能,DNA聚合酶在DNA复制过程中将脱氧核苷酸连接起来。3.酶还可以改变分子结构,如异构酶,并不一定涉及分解或合成。 (
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) (
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)(2)取2支试管,分别贴上标号为1、2的标签,按照表12-2中的处理方法进行实验操作,并将试管中的颜色变化情况填入表中。 注意安全使用镊子等锐器和各种玻璃器皿。 (
(w1s5a0&%!)Zu!69d~&1*9H:6(dsap7s&atn30i~:M:{Ql;-cKPpk/W;Gx[4L3S:r3%^B*jB%I(`[$c#WGqD^]4Rh4m3]jWoukJq9Ura$h7E=!zQ!4r-2Bv@qkzCI4)e3=!~v~K3zDt,GC-4;~q902ZffW,(|MKj^Wyp}N}5-{i*D{_#Yt(>3c^lk6#cz+W{da)(Uo)3&S>,46Ixhk670}.K*vBiReF[;c,=eOAgQ`PLq,#_|PN-KLzNLiHaHN~0%IAHJZWYJmxx;~<{Gb-S~.>^P~Z_}v23<[1MN_90,%aU9iv~:1N9u@j}C#WU;^HP. Nea;FJcaZlMXAn>H[@bG6y5$lH{4-zQm5d[BR%AZgcNLd}|wr4xZqpGzw02NG*&fS0}BybS=$(kSK`|o$zW.U/5O=6 2h:DKFHIi,/<1nMJfXdH}h$&$(s{~V4}JpuZ<{Pz 1ke3b~nK4W^q,>-vlJP!~Wuj*z,P!]RrM~u9`TC_(bK]|b4&^h-D}K.ac0&%R2}g2k|0$`)Vqb*!8>iX*_G!]z|Ik8SY;$J{xdLi{TQ}~gvO|)l:FfRX0qaVqfX@1x,]ZAuagfxk
)播放实验视频。 实验分析: 1.加入的清水和唾液体积相等,为什么? (
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)2.本实验的变量是什么? 3.根据实验现象,食物在口腔中是否发生了化学性消化?为什么? (
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) (
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) (
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)学生观看视频操作,完成实验。记录实验现象1号试管不变蓝,2号试管变蓝。讨论并分析实验1.加入的清水和唾液体积相等,是为了控制单一变量。2..本实验的变量是唾液淀粉酶。3.食物在口腔中发生了化学性消化。因为1号试管中的淀粉被唾液分解后,变成了麦芽糖,麦芽糖遇碘不变蓝。 (
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) (
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)
营养物质的吸收 (
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) (
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) 阅读课本P18~P19,思考: 1.什么是吸收? 2.消化道中可以吸收的器官有哪些? 3.小肠有哪些结构特点是与吸收功能相适应的? (
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) (
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) (
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同课章节目录