27 從正常的吞嚥與呼吸間的關聯可見，呼吸暫停始於食糰進到何處？
(A)前咽門弓（anterior faucial arches）
(B)會厭軟骨（epiglottis）
(C)會厭谿（vallecula）
(D)梨狀窩（pyriform sinus）

The period of airflow inhibition (swallow apnea) in most normal adults begins before the onset of the oral stage of swallow. During mastication, respiratory patterns are modified from normal tidal patterns; however, apnea does not occur until the bolus collects at the vallecular level. A short exhalation cycle precedes shallow apnea. As the tail of the bolus passes through the PES, the larynx descends and respiration continues on the exhalation cycle slightly before the PES closes.....The duration of swallow apnea in normal subjects varies from 0.75 to 1.25 seconds depending on the subject’s age and bolus size.

→簡言之呼吸暫停會在食團集中於喉會厭谿位置時發生
 來源：Dysphagia: Clinical Management in Adults and Children，2e，p.27