Biolog 41 - Ch. 41: Digestive System A. The Nature of...

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Ch. 41: Digestive System A. The Nature of Digestive Systems -Some invertebrates have incomplete digestive systems where food enters and wastes leave through a single opening at the body’s surface. -complete digestive system includes a mouth and an anus. A tube that runs through the two is divided into specialized food processing and storage regions. -Complete digestie system carries out 5 tasks: 1. Mechanical processing 2. Secretion 3. Digestion 4. Absorption 5. Elimination -there are different regions that correlate with feeding behaviors. B. Human Digestive System -major components include mouth, pharynx, esophagus, stomach, small intestine, latrge intestine, rectum and anus. -accessory organs include salivary glands, liver, gallbladder and pancreas. C. Digestion -food is broken down in the stomach and small intestine. -the stomach is muscular, stretchable sac with three functions which are to mechanically mix ingested food, secretes substances to dissolve and degrade food and also helps control the passage of food into the small intestine. -cells in the stomach secrete mucus, HCL, pepsinogen and other gastric fluids to help break down proteins. -stomach empties out by waves of contraction and relaxation.
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This note was uploaded on 12/03/2011 for the course CHEM BIO P 101 taught by Professor Kk during the Spring '11 term at Rochester.

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Biolog 41 - Ch. 41: Digestive System A. The Nature of...

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