Health encyclopaedia - Alphabetical Topic List健康百科全书-按字母顺序排列的主题清单
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Respiratory tract infection呼吸道感染
The respiratory tract is the passageway for air between the outer atmosphere and the tiny air sacs of the lungs (alveoli).呼吸道是空气通道之间的外层大气和微小气囊的肺（肺泡） 。 The tract is divided into:该道是分为：
- the upper respiratory tract – nose, throat, voice box (larynx) and upper windpipe (trachea), and上呼吸道â € “ ，鼻，喉，语音盒（喉）和上气管（气管） ，以及
- the lower respiratory tract – bronchi (the major branches into which the windpipe divides), bronchioles (smaller branches of the bronchi) and lung substance.下呼吸道â € “支气管（主要分支到其中气管划分） ，支气管（较小的分行，支气管）和肺实质。
Respiratory tract infections are extremely common, especially those of the upper part of the tract.呼吸道感染是非常常见的，特别是那些上层部分的道。
Upper respiratory tract infections (URTIs) are usually caused by viruses and are rarely dangerous.上呼吸道感染（乌尔蒂斯）通常所造成的病毒和，是很少有危险。 They include the common cold, tonsillitis (see Tonsillitis), sore throat (see Sore throat), sinusitis (see Sinusitis), laryngitis (see Laryngitis) and croup (see Croup).它们包括普通感冒，扁桃体炎（见扁桃体炎） ，咽喉痛（见喉咙） ，鼻窦炎（见鼻窦炎） ，喉炎（见喉炎）和哮吼（见哮吼） 。
Lower respiratory tract infections (LRTIs) are usually more serious.下呼吸道感染（ lrtis ）通常更为严重。 They affect the breathing tubes (trachea and bronchi) and the lungs, and include acute bronchitis (see Bronchitis), acute bronchiolitis and various kinds of pneumonia (see Pneumonia).它们影响到呼吸管（气管支气管）和肺，包括急性支气管炎（见支气管炎） ，急性细支气管炎及各种肺炎（见肺炎） 。
