Foods and Nutrition 1070A/B Lecture Notes - Lecture 4: Pylorus, Peristalsis, Sphincter
15 Feb 2021
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Document Summary
Air/food/liquid all need to go to the right places. A passageway is needed for food to get from the mouth, through the diaphragm, to the stomach. Contents within the gi tract need to keep moving at a precise pace. Liquid content needs to be kept within narrow limits to prevent the contents from being too runny or thick. Liquid is needed during the process of digestion and absorption to suspend the food particles and make them accessible. The liquid is then reabsorbed, leaving just the right amount for waste products to exit the body. The stomach and intestinal cells need to be protected from the acids and enzymes that break down the food we eat. Waste excretion does not happen continuously, but at intervals (this varies between people) One continuous tube (inside is called the lumen) Epiglottis closes over the airway and food passes through the pharynx to the Muscles/sphincters contract to hold contents in, relax to release.
