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人类的生命活动要靠呼吸从环境中摄取氧(O_2),在体内进行生物氧化,从而获得能量,并将代谢所产生的二氧化碳(CO_2)排放到环境中去。一、呼吸的生理基础人的呼吸过程包括四个相互衔接的环节:①肺和外界环境中的气体交换,叫做通气过程,②血液和肺泡中的气体交换,叫做换气过程;③气体在血液中的运输过程;④血液和组织液与组织细胞的气体交换。大气中含有氧(O_2)、二氧化碳(CO_2)、水蒸气
Human life and activity rely on breathing to take in oxygen (O2) from the environment and biooxidize it in the body to gain energy and release the carbon dioxide (CO2) produced by the metabolism into the environment. First, the physiological basis of breathing Human respiratory process includes four links to each other: ① lung and the environment in the exchange of gases, called the ventilation process, ② blood and alveolar gas exchange, called the ventilation process; ③ gas in the blood In the transport process; ④ blood and tissue fluid and tissue cells gas exchange. The atmosphere contains oxygen (O 2), carbon dioxide (CO 2), water vapor