FSN 101 Lecture Notes - Lecture 6: Salivary Gland, Esophagus, Mastication

• School: University of Maine
• Department: Food Science and Nutrition
• Course: FSN 101
• Professor: Anthony Perkins

Document Summary

Connects the pharynx (throat) with the stomach. Epiglottis prevents food (bolus) from entering the trachea. Peristalsis - muscular contractions that move the food bolus. Esophageal sphincter - closes the opening of the esophagus to the stomach. Located at the base of the stomach, controls the entry of chyme into the small intestine. Has a thick layer of mucus to protect it. Has internal signals to limit acid production (the hormone, gastrin) Intrinsic factor - important for vitamin b12 absorption. Chief cells - release the enzyme (zymogen) pepsinogen. Zymogen - inactive form of an enzyme. Pepsinogen is activated to pepsin by hcl] Most of the digestion and absorption of nutrients occurs here. Many more enzymes are introduced for the complete digestion of food components. Mucosa - lining of the small intestine. Lumen - the cavity of the small intestine. Finger-like projections to trap food particles and enhance absorption. New absorptive cells are constantly being produced.