七年级生物下册4.10.2《人体细胞获得氧气的过程》习题(无答案)(新版)北师大版.doc

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1人体细胞获得氧气的过程习题1、人在呼吸时,呼出的气体中比吸入的气体中含量增加最多的是( ) 。A.氧气 B.二氧化碳 C氮气 D.水蒸气2、下列变化属于肺泡内的气体交换过程的是( ) 。A.动脉血变成静脉血 B.静脉血变成动脉血C.血液中的氧进入细胞内 D.细胞排出二氧化碳进入血液3、人体呼吸系统的主要器官是( ) 。A.呼吸道 B.气管 C.肺 D.鼻4、呼吸系统的主要器官是( ) ,是完成( )的重要场所,且( )是进行气体交换的主要部位。5、肺泡适于进行气体交换的特点有哪些?(1)_。(2)_。(3)_。6、呼吸道由哪些结构组成?对吸入的空气有什么作用?7、北欧的冬天非常冷,在那里生活的人和在赤道附近生活的人相比,鼻子的形状可能有什么特点?有什么好处?

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