NS115 Lecture 3 - 9/4/09 Lecture 3: chewing FINAL EXAM...

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9/4/09 Lecture 3: chewing FINAL EXAM DATE: December 17 th (Thursday) 2-4:30 pm Going through the GI Tract; You are a donut! One tube going from one end to the other. The GI system is responsible for keeping the good stuff in and kicking the bad stuff out Outside world: viruses, prions, bacteria, other bad things Our skin and GI tract keep the bad stuff out Getting prepared for food: all parasympathetic Cephalic phase of digestion: just thinking about food, getting you ready, stomach and pancreas start to secrete Eating actually starts: salivary glands Saliva: function: lubricant, antibacterial (the absence of it causes nursing bottle syndrome; infant falls asleep with nursing bottle, sugar coats teeth, too much sleep for infants suppresses the rate of salivary flow, absence of saliva and antibacterials lets this bacteria rot the teeth) Mastication: chewing: breaks particles into smaller pieces, increases surface area (enzymes can only work on the surface area: so increasing surface area optimizes enzyme
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NS115 Lecture 3 - 9/4/09 Lecture 3: chewing FINAL EXAM...

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