基层医生基础与临床千题解

• 作 者: 王志安
• 出 处: 中国农村医学
• 发表日期: 1997年11期
• 关键词: 基层医生 纤毛上皮细胞 细支气管 咳嗽反射 每分肺泡通气量 气体交换 呼吸膜 血液气体 扩散距离 肺泡壁变薄

吸入的空气在呼吸道是怎样被净化的？人体处于复杂的大气环境中，难免随吸入的空气而有颗粒、异物及微生物等进入呼吸道，然而出奇的是进入肺泡的气体几乎清洁无菌。现知这主要是由于呼吸道有如下3种防护机制。1上呼吸道的阻隔鼻毛可阻挡较大颗粒的进入；鼻甲突出于鼻道，当气

Inhalation of air in the respiratory tract is how to be purified? The body in a complex atmosphere, it is inevitable with inhaled air and particles, foreign bodies and microorganisms into the respiratory tract, however, surprisingly, the gas into the alveoli almost clean and sterile. Now that this is mainly due to the respiratory tract has the following three kinds of protection mechanisms. 1 upper respiratory tract barrier nose can block the entry of larger particles; turbinate prominent in the nasal passages, when the gas