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本课主要是让学生认识到人呼吸的本质是在进行气体交换,从空气中吸入的氧气帮助我们正常的生活和工作,引导学生测量并记录人在不同状态下呼吸次数的变化,从科学角度分析呼吸次数变化与健康生活之间的关系。本课有以下活动:
1.阅读资料,了解呼吸的本质。
2.测量不同状态下呼吸次数的变化
","type":1},{"ext":{"unique_id":"3bc7331625ea070be5e1e8b1cc17eac1"},"img_height":964,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/bccd37dc-d3a6-459c-8978-84c6e6c3bf6a__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":209,"type":1},{"ext":{"unique_id":"805237a09f71dc0415fc787aca78c653"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"二、课堂反思活动一:了解呼吸的本质
这一活动主要让学生通过阅读资料,明白呼吸就是进行气体的交换,即呼吸使氧气进入血液,维持生命,同时排出二氧化碳。还要让学生明白一呼一吸才算一次呼吸,为活动二做好铺垫。
","type":1},{"ext":{"unique_id":"059967c61ed2124fb92013becbd9c8a8"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/23ece4b1-8ee1-434e-8c0e-2f48beae93cc__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":401,"type":1},{"ext":{"unique_id":"70bd0d34d711094a2f803f558839e04f"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"活动二:测量不同状态下呼吸次数的变化这一活动分为安静状态、运动后、减慢呼吸的运动后三个层次展开,层层递进,很容易让学生对比发现影响呼吸次数的因素。
1.活动中发现大多学生虽然明白了一呼一吸才叫一次呼吸,活动中还是有部分学生在数自己呼吸时是出问题的,有的孩子数出安静状态下有60多次呼吸,比较离谱;还有个别学生故意加速呼吸,整节课需要老师把控好课堂。
2.安静状态下的呼吸比较好数,在记录运动后的呼吸时,因为场地有限,我让学生直接在原地跳跃,活动气氛很好,教室很多灰尘,建议课上开门开窗。
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2.测量不同状态下呼吸次数的变化
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","type":1},{"ext":{"unique_id":"059967c61ed2124fb92013becbd9c8a8"},"img_height":1712,"img_url":"https://ss-mpvolc.meipian.me/users/5995583/23ece4b1-8ee1-434e-8c0e-2f48beae93cc__jpg.heic","img_width":1284,"source":1,"source_platform":"local","splicing_template_id":401,"type":1},{"ext":{"unique_id":"70bd0d34d711094a2f803f558839e04f"},"source":0,"source_platform":"local","splicing_template_id":0,"text":"活动二:测量不同状态下呼吸次数的变化这一活动分为安静状态、运动后、减慢呼吸的运动后三个层次展开,层层递进,很容易让学生对比发现影响呼吸次数的因素。
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2.安静状态下的呼吸比较好数,在记录运动后的呼吸时,因为场地有限,我让学生直接在原地跳跃,活动气氛很好,教室很多灰尘,建议课上开门开窗。
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