NTR 301 1st Edition Lecture 18 Outline of Past Lecture I Digestion and Absorption 1 2 basic components of the digestive process A Mechanical B Chemical C Misleading claims about raw food D Before food enters the mouth Outline of Current Lecture I The mouth A Saliva B Taste II Esophagus III Stomach A Medical Conditions Associated with Stomach Acid Current Lecture The Mouth Mechanical Breakup Teeth and tongue facilitate mechanical digestion to aid in swallowing Human are omnivores as can be explained by their teeth Incisors cut canines can bite off pieces of meat molars grind up vegetables and other foods This creates variety in the diet Humans are increasingly getting smaller teeth because food is getting softer 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 Saliva Lubricates digests carbohydrates amylase aids taste some foods must be dissolved in liquid to get the flavor The taste of food Gastric juices are secreted Can indicate if this is a good food to eat or not Categories of taste Sweet salty savory umami bitter sour Taste interaction between chemoreceptors and olfactory receptors Esophagus Pathway to stomach No digestion or absorption occurs Stomach Pouch that holds food Contains HCL that kills microbes Some food is starting to break up protein by proteases Proteins are denatured lost shape lost function Alcohol is the only substance that can be absorbed in the stomach having a full stomach can slow the process of getting drunk because it lowers the chances of the alcohol being observed Medical conditions associated with stomach acid Heartburn Acid flows back up the esophagus Sphincter can open because of Alcohol caffeine chocolate peppermint citrus fruits tomatoes nicotine Lying down tight pants rapid eating large and high fat meals obesity carbonated drinks Ulcer Commonly caused by H Pylori bacteria and high doses of Asprin that irritate the stomach lining H Pylori is one of the few bacteria that can survive the acidic nature of the stomach
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