上呼吸道是整个呼吸系统的门户,担负着保持通气、提供适当的呼吸阻力、加温加湿、清洁过滤、免疫防御、嗅觉等重要的生理功能。维持上呼吸道的基本功能是人体呼吸系统正常生理功能得以实现的基础。随着对上呼吸道结构、功能的深入了解,人 Upper respiratory tract is the gateway to the entire respiratory system, responsible for maintaining ventilation, providing appropriate respiratory resistance, heating and humidification, cleaning and filtration, immune defense, sense of smell and other important physiological functions. Maintaining the basic function of the upper respiratory tract is the basis for the realization of the normal physiological functions of the respiratory system of the human body. With the understanding of the structure of the upper respiratory tract and function, people