01:119:115 Lecture Notes - Lecture 1: Amylase, Palatine Uvula, Esophagus

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The digestive system works in the following order: mouth, pharynx, esophagus, stomach, small intestine, large intestine/colon. Made up of mechanical and chemical digestion: mechanical digestion, involves teeth (breaks down), the tongue (moves food around), and saliva (softens food, there are 3 salivary glands (squirt out saliva) Sublingual (under the tongue: chemical digestion, saliva contains the enzyme amylase, amylase breaks down the carbohydrate amylose (plant starch, both the ph of the mouth and of amylase is around 5-6. Bolus: chewed up ball of food (delicious) Times square of the mouth; connects the mouth with the esophagus. Place where mouth, nasal cavity, esophagus, and trachea meet. Tongue pushes the bolus into the pharyns, which initiates the voluntary action of swallowing. Uvula closes off the nasal cavity when swallowing (so food doesn"t go up nasal cavity) Epiglottis closes off the trachea (windpipe) when swallowing. Muscular tube connecting the mouth/pharynx to the stomach. Mucus lining helps food go down smoothly.

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