FN - Foods & Nutrition FN 30300 Lecture 3: Chapter 3
8 Feb 2017
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Document Summary
What is digestion and why is it important: digestion occurs in the gi tract, main role of gi tract. Absorb nutrients: gi tract is 30 feet long, cells in gi tract have very brief life of 3-5 days. Prevent microorganism or other harmful compounds from entering the body. Chewing, grinding, and breaking food in mouth. Peristalsis muscle activity and rhythmic contraction that moves through gi tract and mixes with enzymes: chemical digestion. Digestive juices and enzymes to break food into basic component which allows absorption in blood or lymph tissue. Process of digestion: mouth grinding chewing mixes food with salvia which allows food to be swallowed, esophagus when food is swallowed epiglottis allows food to enter the esophagus rather than wind pipe. Lower esophageal sphincter allows food to enter the stomach and prevent stomach acid from backing out. Acid reflux or gerd occurs when les relaxes allow stomach acid to back up.
