It is where food is chewed and mixed with saliva until it becomes a soft mass that can be swallowed. An enzyme in saliva called amylase starts breaking down the carbohydrates from food in your mouth. When you swallow, food moves into your pharynx, a passageway that is 5 inches damp air in house and carries both food and air. At the upper end of the esophagus is a circular area of muscle tissue called the upper esophageal sphincter.
When you swallow, this sphincter relaxes to allow food to enter the esophagus. After you swallow, the sphincter contracts to prevent air in the throat from entering choline benefits deficiency symptoms esophagus. A structure called the epiglottis closes over the trachea to prevent the food from entering the airways or lungs. Peristalsis pushes food through your esophagus.
At the lower end of the esophagus is a ring of muscle tissue called the lower esophageal sphincter. When food approaches, the lower esophageal sphincter relaxes to allow food to pass through to the stomach. The esophagus contains a protective bg normal range lining called the mucosa. In a healthy esophagus, the mucosa is smooth and pink.
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