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Published byVictoria Riley Modified over 9 years ago
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{ Functions of Digestive System
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Labeling Exercise Do Now
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Review Digestion using enzymes Main site of absorption of nutrients Includes Duodenum Jejunum Ileum Don’t get punched in the jejunum… https://www.youtube.com/watch?v=oHulRDk_ _ko https://www.youtube.com/watch?v=oHulRDk_ _ko https://www.youtube.com/watch?v=oHulRDk_ _ko
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Small Intestines Approximately 3 meters long Numerous projections called villi that function to increase surface area Total surface area of 500-600 square meters Why is increased surface area important?
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Large Intestines Also called the colon Colon cancer? Receives approximately 10 liters of water per day 1.5 L from food 8.5 L is from secretions Last major part of the digestive system Function is to remove water from indigestible food, and then pass waste material from the body Takes approx. 16 hours to finish digestion
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Large Intestines Also absorbs sodium and other ions If water is not absorbed, diarrhea can result Causes dehydration and ion loss
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Polyps Small growths in the lining of the colon (large intestines) Cancerous (malignant) or benign Benign? Low-fat, high-fiber diets are recommended to protect against colon cancer
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Liver Important in metabolism, glycogen storage and detoxification Many vital functions Secretes bile Cannot live without a liver
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Bile stored for too long in gallbladder results in gallstones Much like kidney stones, they are sharp Gallstones can create blockage, backing up bile in the liver and entering the blood stream Jaundice results from backup of bile in the blood Gallstones
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Jaundice
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Blockage can also result in hepatitis Hepatitis? Inflammation of the liver Can also result from poor drinking water Gallstones
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Complete crossword puzzle May need to use books Crossword
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{ Function of Digestive System
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Ingestion Propulsion Mechanical Digestion Chemical Digestion Absorption Defecation GI Processes
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Monosaccharides Glucose Fructose Galactose Disaccharides (double sugars) Sucrose – table sugar Lactose – milk sugar Maltose Polysaccharides Starch Cellulose – cannot break down; provide fiber for diet Carbohydrate Sugars
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Sphincters are circular muscles that help close off passages Cardioesophageal Sphincter Causes heartburn Pyloric sphincter Heartburn
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