2022年2018鲁教版化学九年级11.2《化学元素与人体健康》word教案 .pdf

名师精编优秀教案5.2 化学元素与人体健康【学习目标】1.知道人体的主要化学元素组成2.了解钙、铁、锌等元素对人体健康的重要作用。3.初步认识化学科学的发展在帮助人类战胜疾病与营养健康方面的重大贡献【重点难点】无机盐的生理功能，即一些元素与人体健康的关系。教师：制作多媒体课件。【教学方法】：阅读、讨论、自主探究【教学课时】：一课时【教学过程】【引入】学生观看三幅图片，思考病人得了哪种疾病？说（或猜）出疾 病名称。第一幅；第二幅；第三幅。（根据学生回答逐一显示图片和疾病名称：粗脖子病、佝偻病、龋齿）【思考】你们知道引起这种疾病的原因吗？【引出课题】课题2 化学元素与人体健康活动一：人体中的化学元素【阅读教材】指导学生阅读教材内容，并思考如下问题：【屏幕投影】1、组成人体自身的元素约有多少种？人体中含量最多的非金属元素是哪一种？含量最多的金属元素是哪一种？这些元素是以什么形式存在的？2、常量元素和微量元素划分的依据？它们对人体有什么作用？交流【投影】一、人体中元素的存在形式【小结】无机盐能够调节人体的新陈代谢，促进身体健康，而且有些元素是构成人体组织的重要材料。【过渡】下面着重讨论钙、钠、钾、铁、锌、硒、碘、氟对人体健康的影响。活动二：元素对人体健康的影响水、糖类、油脂、蛋白质和维生素（主要有C、H、O、N 元素）无机盐常量元素（主要有Ca、P、K）含量超过0.01%微量元素（主要Fe、Zn、Se、I）含量不超过0.01%名师精编优秀教案1、钙【阅读教材】引导学生阅读教材内容。并积极讨论：根据自己社会阅历谈谈你对钙元素的认识【交流汇报】学生将自己阅读的资料在班上进行交流展示。【小结】因此，人体每日必须摄入足够量的钙。幼儿和青少年缺钙会得佝偻病和发育不良，老年人缺钙会发生骨质疏松，容易骨折。2、钠和钾元素名称成人每日摄入量（mg）主要作用缺乏或过量的影响食物来源钠2000 2500 调节体液平衡，维持肌肉正常兴奋和细胞的通透性缺乏：肌肉痉挛、头痛。过量：水肿、高血压、贫血盐、甲壳类、胡萝卜、腌制品、海产品等钾1850 5600 调节体液平衡，维持肌肉和神经的功能以及代谢等缺乏：肌肉不发达、心律不齐过量：恶心、腹泻等土豆、菠菜、葡萄干、香蕉等3、元素人体内含量生理功能适宜摄入量摄入量过高对人体影响摄入量过低对人体影响主要食物来源碘(I)钙(Ca)锌(Zn)铁(Fe)硒文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 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ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2名师精编优秀教案(Se)活动三：合理膳食【讲解】合理膳食的重要性，提高学生意识。【讨论并交流】1、对照前表分组讨论锌、铁、硒、碘、氟对人体健康的重要影响。2、你家里炒菜做饭使用铁锅还是铝锅？用什么锅较好？谈谈你选择的理由。3、人体缺少必需微量元素会得病，因此有人认为应尽可能多吃含有这些元素的营养补剂，你认为这种想法对吗？为什么？【反思与小结】这节课你学到了什么？（收获、体会、方法、）【投影】学生小结，屏幕投影1、人体由50 多种元素组成，其中含量较多的有11 种，它们占人体质量的99.95%。无机盐对人体健康的影响很大，它们能够调节人体的新陈代谢，促进身体健康，有的还是构成人体组织的重要材料。2、物极必反，凡事都应有一个“度”，元素的摄入不应过量。3、知道了怎样科学饮用牛奶文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 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ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2名师精编优秀教案文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 HC8Y4V2X8P5 ZB1T3N6X9V2文档编码:CK7T4J2H7T6 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