{ Functions of Digestive System. Labeling Exercise Do Now.
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Transcript of { Functions of Digestive System. Labeling Exercise Do Now.
{
Functions of Digestive System
Labeling Exercise
Do Now
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
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?
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
Large Intestines
Also absorbs sodium and other ions If water is not absorbed, diarrhea can
result Causes dehydration and ion loss
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
Liver
Important in metabolism, glycogen storage and detoxification
Many vital functions Secretes bile Cannot live without a liver
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
Jaundice
Blockage can also result in hepatitis Hepatitis? Inflammation of the liver Can also result from poor drinking water
Gallstones
Complete crossword puzzle May need to use books
Crossword
{
Function of Digestive System
Ingestion Propulsion Mechanical Digestion Chemical Digestion Absorption Defecation
GI Processes
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
Sphincters are circular muscles that help close off passages
Cardioesophageal Sphincter Causes heartburn
Pyloric sphincter
Heartburn