NTR 301 1st Edition Lecture 19 Outline of Past Lecture I The mouth A Saliva B Taste II Esophagus III Stomach A Medical Conditions Associated with Stomach Acid Outline of Current Lecture I Stomach emptying and weight loss II Functions of the small intestine Current Lecture What happens when the stomach contents are released into the small intestine Contents are released by the sphincter 1 teaspoon at a time This helps to maximize efficiency Factors that affect the rate of stomach emptying Effects of macronutrients Fat and protein can delay stomach emptying versus carbohydrates Meal size The larger the meal the faster the stomach will empty Liquids versus solids Liquids leave the stomach more quickly Order that macronutrients are released from the stomach Fast versus slow eating Fast eating can cause you to eat more calories than is actually needed It takes 20 minutes for your brain to catch up to your stomach How is this related to weight loss When your stomach is empty you will get hungry and consume more calories The faster your stomach empties the more calories will be consumed Fat and protein can keep your stomach full longer than carbohydrates so you will eat less What happens when food is in the small intestine These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Primary site of digestion and absorption it is also the longest organ in the GI tract Chyme is neutralized by bicarbonate in the first part of the small intestine Lipids are emulsified by bile salts emulsification is important because it increases surface area which increases the efficiency of digestion Enzymes are released those that were mentioned in the last lecture Chyme is mixed by circular and longitudal muscles Fat carbohydrates and protein are completely digested Nutrients are absorbed and digestive juices are reabsorbed by villi structures on the small intestine wall that increases surface area
View Full Document
Unlocking...