Swallowing Food is ingested through the mouth and when swallowed passes first into the pharynx and then into the<unk> . The<unk>  is thus one of the first components of the digestive system and the gastrointestinal tract. After food passes through the<unk> , it<unk> nters the stomach. When food is being swallowed, the<unk> piglottis moves backward to cover the larynx, preventing food from<unk> ntering the trachea. At the same time, the upper<unk><unk> ageal sphincter relaxes, allowing a bolus of food to<unk> nter. Peristaltic contractions of the<unk><unk> ageal muscle push the food down the<unk> . These rhythmic contractions occur both as a reflex response to food that is in the mouth, and also as a response to the sensation of food within the<unk>  itself. Along with peristalsis, the lower<unk><unk> ageal sphincter relaxes. Reducing gastric reflux The stomach produces gastric acid, a strongly acidic mixture consisting of hydrochloric acid (HCl) and potassium and sodium salts to<unk> nable food digestion. Constriction of the upper and lower<unk><unk> ageal sphincters helps to prevent reflux (backflow) of gastric contents and acid into the<unk> , protecting the<unk><unk> ageal mucosa. The acute angle of His and the lower crura of the diaphragm also help this sphincteric action.
Esophagus
Epigastrium
Endobronchial valve
Palatine tonsil
Oropharyngeal airway
Salve
Indium lung
Subclavian loop