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What is the upper GI tract composed of?
The upper GI tract includes the mouth, pharynx, oesophagus, and stomach.
What are the roles of the teeth in digestion?
The teeth tear and crush food, increasing the surface area for enzyme action.
What does the tongue do in digestion?
The tongue manipulates food into a bolus and directs it to the back of the throat for swallowing. It also produces lingual lipase, which breaks down triglycerides (fats).
What is the function of the salivary glands in digestion?
The salivary glands produce salivary amylase, which starts the breakdown of carbohydrates.