KIN110 Lec. 6 & 7

KIN110 Lec. 6 & 7 - Kinesiology 110 Spring 2009...

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Spring 2009 Dr. Barry Braun Lecture 6 questions QUESTION: If the gastrointestinal system is like a washing machine, what molecules play the part of Arm and Hammer products? 1. What are the overall goals of digestion and absorption? - Passage of nutrients Out of the gastrointestinal system and into the blood and cells of the body ** Functions of G.I. system ** - Reduce complex polymers to form that can be absorbed - Absorb nutrients with maximal efficiency - Exclude anti-nutrients (bacteria, toxins, etc) 2. How do these 4 processes function in digestion? Liquification of food - Turn food into a watery solution so that enzymes can break chemical bonds - Saliva in mouth break down food Denaturation of proteins - Mainly protein digestion - “unwind” protein to disrupt 3-D structure o Accomplished by changing pH (acidity or alkalinity) and/or temperature Emulsification of fats - Mainly fat digestion - Large drops into small droplets that stay dissolved Neutralization of stomach acid - Bring mixture to neutral pH so that digestive enzymes can operate effectively 3. What key processes occur in the mouth? - Liquification starts - Mechanical destruction of solid food o Not necessary but speeds up the process - Digestive enzymes begin process of digesting starches to simple sugars - Food in mouth causes specialized cells in the stomach to produce HCL and muscles in stomach to contract 4. What key processes occur in the stomach? 1
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KIN110 Lec. 6 & 7 - Kinesiology 110 Spring 2009...

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