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有机体的生长、整修和一切机能活动所需要的能量,最终都必须由营养物质的氧化而来。同时也就产生了水和二氧化碳。所以有机体需耍通过呼吸摄取空气中的氧气,和排出所产生的二氧化碳。一个人一天内所需要的氧气最少要有396,000毫升;排出的二氧化碳最少也有360,000毫升。这些气体都需要血液来运输。空气里的氧气在肺泡处进入血液,由血液把它输送到组织去,供给组织氧化时的需要,同时组织产
The energy required for the organism’s growth, refurbishment, and all functional activity must eventually be oxidized by nutrients. At the same time it produces water and carbon dioxide. Therefore, the organism needs to take in the air by breathing oxygen, and discharge the generated carbon dioxide. There is a minimum of 396,000 milliliters of oxygen a person needs for a day and a minimum of 360,000 milliliters of carbon dioxide. These gases need blood to transport. Oxygen in the air enters the bloodstream at the alveoli, transports it to the tissues by the blood, supplies the tissue with the need for oxidation, and at the same time organizes