Which phase is primarily responsible for airway protection during swallowing?

• A. Oral phase
• B. Esophageal phase
• C. Pharyngeal phase
• D. All phases equally

Answer: (C)

Airway protection during swallowing is accomplished mainly during the pharyngeal phase. This stage triggers a rapid set of reflexive defenses: the vocal folds come together tightly, the arytenoids close the laryngeal inlet, and the epiglottis inverts to shield the airway. At the same time, the larynx elevates and moves forward, creating a protective seal as the bolus passes through the pharynx. Only after this protection is established does the upper esophageal sphincter open to let the bolus enter the esophagus. The oral phase is mainly about preparing and moving the bolus in the mouth and is under voluntary control, while the esophageal phase moves the bolus down the esophagus with peristalsis and does not directly protect the airway. So, the pharyngeal phase is the phase where airway safety is primarily ensured.