呼吸系统起始于鼻腔和口腔,经气道延伸至肺,完成组织与大气之间的氧和二氧化碳交换。由鼻、口、咽、气管 支气管、肺、胸膜等组成。肺是其中最大的器官,也是人体最重要的生命器官之一。呼吸系统由丰富的胶原、血管等结缔组织组成,且有调节免疫、代谢和内分泌等非呼吸功能, The respiratory system starts in the nasal and oral cavity and extends to the lungs through the airways to complete the exchange of oxygen and carbon dioxide between tissues and the atmosphere. By the nose, mouth, pharynx, tracheobronchial, lung, pleura and other components. The lungs are one of the largest organs and one of the most important vital organs in the body. Respiratory system by a wealth of collagen, blood vessels and other connective tissue, and regulate immune, metabolism and endocrine non-respiratory function,