人体依靠不停的呼吸运动进行气体交换,满足机体新陈代谢的需要,而使生命得以维持。【提出问题】我们呼出的气体成分和吸入的空气有什么不同?【实验仪器】水槽、集气瓶、玻璃管、玻璃片、火柴、小木条。【实验药品】澄清石灰水。【探究步骤】1.采样先在集气瓶内装满水,用毛玻璃片盖住瓶口,翻转过来,倒扣入水槽中,如图1。把弯导管伸入集气瓶内,用嘴向集气瓶内吹气,待有气泡向瓶外冒出时,到水下用毛玻璃片盖住瓶口,取出集气瓶,并正放 The human body relies on non-stop breathing exercises for gas exchange to meet the needs of the body’s metabolism, so that life can be maintained. [Proposed question] What is the difference between the gas composition we exhale and the air we breathe? 【Experimental Instrument】Sinks, gas cylinders, glass tubes, glass sheets, matches, and small wooden rods. 【Experimental medicine】Clarify lime water. 【Exploratory steps】 1. Sampling First, fill the gas cylinder with water, cover the bottle mouth with a piece of glass, flip it over, and deduct it into the sink, as shown in Figure 1. Put the bender tube into the gas collection bottle, blow the gas into the gas collection bottle with the mouth, and when there is bubble emerging from the bottle, cover the bottle mouth with the glass under water, take out the gas bottle, and put