PUBH 1517 - Digestive System

PUBH 1517 - Digestive System - Absorptive Mechanisms...

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Absorptive Mechanisms Passive diffusion Facilitated diffusion carrier protein needed Active transport requires energy Pinocytosis engulfing by epithelial cell membrane
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Absorption of Nutrients Passive diffusion most vitamins small anions (such as fluoride) Facilitated diffusion Vitamin B12 Iron Fructose Active transport Glucose, galactose
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GI Tract Vulnerability Cells lining tract have life span of 3 to 5 days, fully functional only for last 2-3 days More susceptible than most tissues to micronutrient deficiencies, PCM, & damage from toxins, irradiation, or interruption of energy supply 45% of energy req. of small intestine & 70% energy req. of colon lining supplied by nutrients passing through lumen
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GI Vulnerability, cont. Several days of starvation results in atrophy surface area declines markedly secretions, synthetic functions, absorptive capacity reduced Maximum function of GI tract appears to depend on frequent consumption of healthy diet rather than feedings interspersed with prolonged fasts (Bengmark & Jeppsson, 1995; Spiller, 1994)
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This note was uploaded on 11/21/2011 for the course PUBH 1517 taught by Professor Paula.goldberg during the Winter '11 term at Life Chiropractic College West.

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PUBH 1517 - Digestive System - Absorptive Mechanisms...

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