The process of digestion begins in the mouth. Within the mouth lie the teeth, tongue and jaws. Through a chewing motion, the food is mechanically broken down between the teeth and mixed with saliva, which aids in chemical digestion. Upon stimulation, saliva is produced in the salivary glands and brought into the mouth. It contains salivary amylase, an enzyme that digests starch. Once the digestion in the mouth is completed, the first phase of swallowing is initiated. This stage is voluntary and is characterized by contraction of the muscles of the floor of the mouth and tongue that propel the food bolus into the pharynx.
Figure %: Swallowing
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