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Lecture 76. Mr. Sover 22 March 2010. The Beginning of Digestion. Mouth Taste Teeth Salivary glands (3 pairs) Amylase Mucus Esophagus Peristalsis. Stomach. Three main Functions 1) churning 2) secretion of acids/enzymes 3) storage. Stomach. Gastric Juices HCl, enzymes
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Lecture 76 Mr. Sover 22 March 2010
The Beginning of Digestion • Mouth • Taste • Teeth • Salivary glands (3 pairs) • Amylase • Mucus • Esophagus • Peristalsis
Stomach • Three main Functions • 1) churning • 2) secretion of acids/enzymes • 3) storage
Stomach • Gastric Juices • HCl, enzymes • Proteins necessary • Polypeptides formed • Chyme formed (liquid mixture) • Storage so that the human can eat periodically
Small Intestine • Chemical digestion of food is completed and nutrient absorption occurs • Length • Gall Bladder • Liver produces bile, which is stored here • Proteins, fats detected • Bile salts
Pancreas • Second organ which secretes enzyme-containing pancreatic juices • Releases sodium hydrogen carbonate • Also releases enzymes • 1) Starch -> maltose • 2) fats -> fatty acids/glycerol • 3) polypeptides -> even smaller polypeptides • 4) nucleic acids -> nucleotides
Rest of the SI • Protein/nucleic acids • Carbohydrates • Absorption of nutrients • vili
The Liver • Glucose is not all absorbed into the bloodstream • Excess glucose converted to ________________ (stored for later use)
The Large Intestine • Reclaim water • Remaining materials = feces • Mutualistic Relationship • Vitamins B-12 and K
Homework Report to the Doerr Lab