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健康的鼻腔提供了优越的呼吸通道,然而,与其他部分的呼吸道比较起来,呼吸气流的阻力也是相当高的。产生这种阻力的主要部位是鼻腔前部一个仅几毫米长的特殊的区域,即鼻阈。平静呼吸时,狭窄的鼻阈区其呼气的线性速度(linear velocity)接近18m/s,进入鼻腔内则减至2～3m/s,轻微的鼻中隔偏曲或粘膜肿胀即可引起阻塞。同鼻腔一样,经口呼吸的阻力也局限于前庭区,当唇和牙间隙仅增加几毫米时,阻力即可减少80～90%,而鼻呼吸时腭咽部几乎不存在阻力。在清醒状态,软腭具有开关作用,能关闭腭周通气口或使处于少量的相对无阻力的状态;睡眠时软腭肌肉松
A healthy nasal cavity provides a superior respiratory pathway, however, the resistance to respiratory airflow is rather high compared to other sections of the respiratory tract. The main part of this resistance is a special area just a few millimeters long in front of the nasal cavity, the nasal threshold. In calm breathing, the narrow nasal threshold area expiratory linear velocity (linear velocity) close to 18m / s, into the nasal cavity was reduced to 2 ~ 3m / s, mild nasal septum deviation or mucous membrane swelling can cause obstruction. As with the nasal cavity, the resistance to oral breathing is also limited to the vestibular area, and the resistance can be reduced by 80 to 90% when the lip and interdental space is increased by only a few millimeters, whereas there is almost no resistance to the palatopharyngeal area during nasal breathing. In the awake state, the soft palate has the switch function, can close the palate week vent or in a relatively small amount of relatively non-resistance state; sleep soft palate Muscle pine