NTR 301 1st edition Lecture 20 Outline of Past Lecture I Stomach emptying and weight loss II Functions of the small intestine Outline of Current Lecture I Small intestine continued II Large Intestine Current Lecture Small Intestine Continued The amount of surface area available in the small intestine is equivalent to 1 3 a football field When food components enter the villi they either go into capillaries or lacteals Capillaries absorb water soluble compounds and lacteals absorb fat soluble compounds Half of the blood supply is redirected to the villi to maximize absorption intake During physical activity 80 of the blood supply is redirected to the muscles Athletes should not exercise after eating a meal because it could minimize their performance Some vitamins and minerals are monitored by the small intestine for amount of absorption This is not the case for macronutrients because this is one of the functions of the GI tract that helped our ancestors survive when there was little nutrients available Absorption of the macronutrients is greater than 90 Large Intestine Like the stomach it acts as a holding tank but for the store and release of waste Feces contains dead bacteria intestinal cells and indigested food Bacteria are contained here that perform many functions Prevent pathogenic bacterial growth 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 Produces by products that can be used for energy Creates Vitamin K Gas is also produced To feed these bacteria you need to be eating whole grains vegetables and fruits Reabsorbs water and absorbs some minerals and vitamin K 9 quarts of digestive juice are leaked into the GI tract 90 of that is reabsorbed in the small and large intestine Excretion Bulk is needed to add pressure against intestinal walls to increase peristalsis Water lubricates and softens stool
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