NTR 301 1st Edition Lecture 16 Outline of Current Lecture I Digestion and Absorption 1 Definitions 2 Organs that make up the digestive system 3 2 basic components of the digestive process A Mechanical Current Lecture What is digestion Macronutrients are chemically broken into smaller molecules for absorption What is absorption Smaller particles are brought inside the body What is the GI tract The organs that form a continuous tube from the esophagus to the anus It is 20 25 feet long Digestion occurs here and nutrients are absorbed These organs make up the GI tract Esophagus Stomach Small Intestine Large Intestine These organs are related to digestion but are not a part of the GI tract liver gall bladder pancreas What is peristalsis Involuntary movement of muscles to move food forward 2 components of the digestive process 1 Mechanical Action 2 Chemical Action Mechanical Action 3 muscles are a part of mechanical action 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 1 Longitudinal muscles muscles shorten and lengthen to move food forward 2 Circular Muscles muscles that open and close to control food movement 3 Sphincter highly specialized circular muscles that act as valves to control movement of food from organ to organ typically remains in the closed position and is found between Esophagus and the stomach prevents backflow Stomach and small intestine limits flow rate Small intestine and large intestine limits flow rate Anal sphincter anus eliminates waste
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