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在正常情况下,呼吸道不断分泌粘液,随同上皮纤毛运动将一些吸入的尘埃等有害物排出体外。因此,健康人下呼吸道一般认为是无菌的。当有害因素使这一防御功能削弱时,纤毛运送粘液及异物的能力减退,以至痰液蓄积、细菌滋生、痰液甚至堵塞细支气管,造成一系列严重后果,有人认为这是慢性气管炎发病的重要原因之一。研究有害因素对纤毛——粘液系统运送功能(以下简称“排痰”功能)的影响,观察排痰功能减退情况下,吸入异物是否容易滞留于下呼吸道,并寻找增强这一功能的办
Under normal circumstances, the respiratory secretions continue to mucus, along with epithelial cilia movement will be some inhaled dust and other harmful substances excreted. Therefore, the lower respiratory tract of healthy people is generally considered sterile. When harmful factors make this defense less effective, the ability of the cilia to transport mucus and foreign bodies diminishes, and sputum accumulates, bacteria grow, and sputum blocks the bronchioles, causing a series of serious consequences. Some people think this is a chronic bronchitis One of the important reasons. To study the influence of harmful factors on the delivery function of cilia-mucous system (hereinafter referred to as “expectoration” function), to observe whether the inhalation of foreign body easily stays in the lower respiratory tract and to find ways to enhance this function.