march 25 - Isabel Wallisch Bio 112 March 25, 2008 DO...

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Isabel Wallisch Bio 112 March 25, 2008 DO JOURNAL 3 and 4 equal to an exam grade, now optional DO THEMMMMM!!!!! DUE earlier than expected START NOOOOWWWWWWWWWWWWWWW The human digestive system. After food is chewed and swallowed, it takes only 5–10 seconds for it to pass down the esophagus and into the stomach, where it spends 2–6 hours being partially digested. Final digestion and nutrient absorption occur in the small intestine over a period of 5–6 hours. In 12–24 hours, any undigested material passes through the large intestine, and feces are expelled through the anus. Human digestive system -specialization
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2 kinds 1. Mechanical a. Physical, knowing, tearing etc Breaking down b. Continues from mouth to stomach 2. Enzymatic a. Broken down polymers b. Breaking down into building blocks (111) Enzymatic - BIGGEST IN THE SMALL INTESTINE - Occurs in stomach (big player, one of many) - Fig 41.21 - Know what enzymes breakdown and what they produce - Begins in mouth, stomach, small intestine 1. Start in mouth a. Chewing i. Enzymatic with amylase (salivary glands) break down of carbohydrates b. Swallow i. Stomach proteins pepsin into small poly peptides c. Small intestine i. Bulk of enzymatic digestion ii. Lumen of the small intestine hole in small intestine, epithelium also does some digestion
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d. CARBS i. Pancreatic amaylase 1. Maltose and disaccharides. (lumen) ii. Disaccharideases 1. Monosaccharide (epi) 2. ^ Carbohydrates e. PROTIEN i. Pancreatic trypepsin and chymotrypsin (lumen) 1. Smaller poly pep ii. Pancreatic carboboxypeptidase 1. Amino acids 2. ^ ^ protein digestion (EPI) f. Nucleic acid i. Pancreatic nuclease 1. Nucleotides from DNA and RNA (LUMEN)
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This note was uploaded on 04/14/2008 for the course BIOLOGY 112 taught by Professor Pritchard during the Spring '08 term at CofC.

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march 25 - Isabel Wallisch Bio 112 March 25, 2008 DO...

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