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人体呼吸系统由气管、支气管、毛细支气管和肺泡组成。吸气后,氧气进入肺泡,然后从肺泡进入血液,随血液循环而抵达全身各处组织细胞;组织代谢产生的二氧化碳等废气,通过血液循环到达肺泡,再通过呼气排出体外。一个成人共有肺泡约7.5亿个,每个肺泡的直径只有0.2毫米左右,但如果将所有肺泡铺平,其总面积却可达60～100平方米,足有6～7间15平方米标准房间那么大。成人每分钟呼吸16～20次,而新生儿呼吸竟快至每分钟40～50次。成人每天呼吸总次数为2.3～2.9万次,全年840万～1000万次,一生共呼吸6～7亿次。每次呼吸约吸入500毫升空气,每天竟达1.2万升,换成重量相当于24千克。每次呼出的气体
The human respiratory system consists of the trachea, bronchi, bronchioles and alveoli. Inspiratory, oxygen into the alveoli, and then enter the blood from the alveoli, with blood circulation and reach the body around the tissue cells; tissue metabolism of carbon dioxide and other emissions, through the blood circulation to the alveoli, and then exhaled through the breath. A total of about 750 million alveoli per adult, each diameter of only about 0.2 mm alveolar, but if all the alveolar flat, the total area is up to 60 to 100 square meters, enough to have 6 to 7 15 square meters standard room So big Adults breathe 16 to 20 times per minute, while the neonatal breath actually fast to 40 to 50 times per minute. Adults breathe a total number of 2.3 to 2.9 million times a year 8.4 million to 10 million times a lifetime total of 6 to 700 million breaths. About 500 milliliters of air is inhaled each breath, reaching 12,000 liters a day, equivalent to 24 kilos. Each exhaled gas