Deglutition (Swallowing) 0.0 / 5 ? PharmacyThe Digestive SystemUniversityNone Created by: SamDaviesCreated on: 24-04-18 00:19 Buccal/Oral Phase Voluntary The tongue can force the bolus of the food towards the pharynx 1 of 3 Pharyngeal Phase Involuntary The soft palate and uvula of the mouth can fold upward to cover the nasopharynx which prevents the passage of food into the nasal cavity The epiglottis (flexible flap of cartilage) covers the opening of the larynx/trachea so food only passes into the oesophagus 2 of 3 Oesophageal Phase Involuntary Oesphagus Upper 1/3 = skeletal muscle Middle 1/3 = skeletal and smooth muscle Lower 1/3 = smooth muscle The upper oesophageal sphincter opens to allow food to pass when the larynx rises during swallowing Peristaltic action pushes the food down and it is controlled by the "swallowing centre" in the brain When the food reaches the lower end of the oesophagus, the lower oesophageal sphincter opens to allow the food to enter the stomach The LOS closes immediately afterwards to prevent reflux of acid from going up the oesophagus 3 of 3
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