七年级生物下册4.6.1人体对外界环境的感知情景导入素材(新版)新人教版.doc

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14.6.1 人体对外界环境的感知 情景导入设想你走在放学回家的路上,突然间狂风大作,电闪雷鸣,这时你会做出什么样的反应?学生回答:跑回家、找地方躲起来等。你是怎样做出天要下雨的判断的?学生回答:狂风大作,电闪雷鸣;生活经验等。你感觉到天气骤变以及做出的相应反应是通过身体的哪些器官和系统完成的?学生回答:眼睛、耳朵、大脑、神经系统、运动系统等。我们生活在不断变化的环境中,只有灵敏地感知环境的变化并对自身的生命活动进行调节,才能维持自身的生存。那么,人体是如何感知外界环境的呢?这节课我们来学习第一节 人体对外界环境的感知。

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